the filmy, moist, dead skin particles, that gets stuck underneath your fingernails when reaching inside your shorts to scratch that crack itch. this substance may perhaps be caused by sweat, forming a cream-like layer that can easily be removed.
bob: man i had the most insane itch in my crack and when i scratched it, there was a bunch of smelly gunk under my nails, i thought it was shit but it was like....soft dead skin..o_O
ned: yah man! looks like you got a case of bad buttcrack-plaque!
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."