We use Happy Stick as well; I'm pretty sure I picked it up during my RPGA play, too.
Some of our other terms:
FM: acronym for "f***ing magic". Explanation for anything that the PCs encounter that the PCs (or, for that matter, the players) have no explanation for. Usually occurs when the DM is ad-libbing badly.
Hot Donuts: term for the little tents or signs that our players have made up to act as reminders of ongoing party buffs (Inspire Courage, Bless, etc.); typically, the signs get hung up on my DM screen so that everyone can see them. I dubbed them "Hot Donuts" after the sign that gets lit up at a Krispy Kreme store when they've got fresh donuts for sale ("Hot Donuts Now!").
GOOMB: acronym for "Get out of my brain." Used in our online gaming group, right after two people post the exact same idea into the chat room.
Cleric Initiative: a lousy initiative roll. Named such because many clerics both (a) have poor initiative modifiers, and (b) seem to frequently compound the bad modifier with a bad die roll.
Stendan's Disease: named for my RPGA Living Force character, a scoundrel named Ril Stendan. Scoundrels in Star Wars have the "Lucky" ability, which lets them re-roll a d20 (similar to the Luck domain ability in D&D). Ril was infamous for getting a bad roll, invoking Lucky to re-roll the d20, and getting an even worse roll the second time.
Kinnington's Disease: named for my friend Steve's Living Force character, a Jedi named Bon Kinnington. Bon had an awful Spot modifier, and Steve would always roll poorly on the d20 for Spot checks, as well. So, Kinnington's Disease is the complete inability to see or notice anything.
UCT: acronym for "Universal Cutting Tool" -- euphamism for a lightsaber.
Door Clog: melee combat that occurs in a doorway, or other constricted space, and which results in half of the party having no way to contribute to the fight.
Melt Them With My Brain: using any psionic attack.
Greyhawking: looting the bodies of fallen foes. We didn't make this one up...Living Greyhawk (especially in its first year or two) can be stingy with loot, and if you don't greyhawk the bodies, you lose out on what may be your only source of treasure.
Tuttle: a PC built to max-out melee damage output, almost always with a two-handed weapon. One of our players created a PC named Tuttle, who was just a damage-dealing machine with his greatsword and Power Attack. Since then, if someone wants to create a similar fighter, they say, "I wanna make a Tuttle."
Touch and Scream: in the RPGA's Living Death campaign, there's a skill called Psychometry, that lets you pick up psychic images left on items, usually by intense / traumatic events. For example, if you used psychometry on a murder weapon, you might be able to psychically relive the murder. The better the psychometry roll, the more you can learn...but a good roll can also imperil the user's sanity.
