Bone dagger: To slay a powerful opponent very quickly (typically in 1 attack from 1 person) due to unusual luck via dice rolls.*
* This term resulted from a 2nd ed. AD&D game where one PC's lucky attack roll (a halfling throwing a normal bone dagger) against another tougher PC (a sort of homebrew half-dragon fighter--high HP & AC); the halfling rolled a critical, then rolled an instant kill effect on a % crit/fumble chart we used from Dragon magazine. It still is a possibility in our 3.X games due to the use of the optional "instant kill crit chain" rule from the DMG (IIRC, three natural 20's & you're dead).
Flea/Flee: A character who, despite all best attempts of the player (and possibly DM) to kill it off, manages to survive & succeed. The character typically must be severely limited, whether in low ability scores, a poor ability score/class mix (e.g., low-Cha sorcerers, wizards constantly without a spellbook, warriors with low Str, Dex, & Con scores, etc.).* In addition, a character's status as a "Flee/Flea" can be confirmed if he/she has had one or more "bone dagger" (see above) moments in game.
* This term resulted from a player who named his human fighter 2/mage 1+ (2nd ed. AD&D, BTW) PC "Flee," since the character only had 1 spell (Jump), no spellbook, & at the beginning of the game, couldn't use any fighter gear due to dual-classing restrictions. IIRC, the character also had relatively average stats for the most part (and the player didn't care for characters who didn't have a 14/15+ in every stat, with at least 1 or more 18+ stats). But, despite all of the player's best intentions to kill off this PC, the character survived, & actually punched out a red dragon (a beneficial misinterpretation of the rules that never occurred afterward). After these positive experiences, the PC's name changed slightly from "Flee" to "Flea the Fearless."
It's a Pull: When a player/PC does something embarassing/stupid due to hasty action, which could have been easily avoided due to a brief moment of reason/observation; typically provided as an explanation for a botch/skill roll failure for a supposedly easy action.*
* This term came from a Heroes Unlimited game, where a PC tried to quickly enter a mall filled with supervillains & hostages. The PC did a quick acrobatic roll & jumped into a door, expecting to quickly push the door open & enter the building. The PC botched the roll, & wound up slamming into the door. When the PC's player asked me why the PC wasn't able to perform the action, I merely responded with "It's a pull." (i.e., that particular door had to be pulled open instead of pushed open).
I Make a Dodge: A player stating/making an action that is rather irrelevant to the game situation at hand, mainly due to the fact that the player is preoccupied with something else & is not paying attention to the game.*
* I'm guilty for this one. During an Aliens game, I was busy talking with a friend who I hadn't seen in a while. Last I knew, the PCs were in the middle of a combat, so my PC was busy dodging. However, if I had payed attention to the game, my PC would have evacuated the ship (with the other PCs) before it detonated. Of course, I failed to pay attention, & kept saying "I make a dodge." My friends were quite amused, to say the least, envisioning my PC trying to dodge an exploding ship, which happened to be in outer space, & that said PC happened to be onboard.
Get Guy, Hit Car: A situation where a rather unintelligent character easily messes up a supposedly easy request/command/task.*
* My g/f created this through sheer roleplaying. In a villains side-game for Marvel Super Heroes, my g/f's PC (a rather dumb, flawed clone of Wolverine--sort of a mix between Bizarro & Wolverine) was ordered by one of the other PC-villains to, in these words, "Hit guy, get car" (i.e., attack the vehicle's owner, who was outside of the vehicle, and steal said vehicle). Well, RPing the character to the hilt, my g/f's PC-villain said "Hit guy, get car. Hit guy, get car. Get guy, it car." (ala the infamous Bugs/Daffy "Duck Season/Rabbit Season" switcheroo). Said PC-villain grabs the guy, then hits the car. It brought an added comic element to the villains side-game, & the game evolved into a mini-campaign of down-on-their-luck, beginner, occassionally incompetent villains (the PCs) trying to make a name for themselves, and often getting thwarted by superheroes of lower-tier caliber (ala Capt. Ultra, Great Lake Avengers/Lightning Rods, Forbush-Man, etc.).
There may be a few other ones I'm forgetting, but these are the most memorable.
