Ahh...nothing like living in the South for this sort of stuff.
My dad, who I loved and miss dearly, was a man of little patience. If I couldn't find the tool he asked me to send, he'd say, "Boy, you couldn't find your a** with a search warrant in each hand."
If we were target shooting, and I missed, he say, "Boy, you couldn't hit a bull in the a** with a bass fiddle."
I used to roady for a honky tonk band. Our soundboard died in the middle of a pretty big show. Our drummer, also the lead singer, just shook his head and said, "Well, looks like it swallered its own a**".
I notice "a**" gets a lot of use around here....
Others I remember are "Beat you like a borrowed mule", "ride you like a stolen bicycle", and if you needed to put a block behind the wheel of a vehicle, it was called "scotchin'".