A handjob in which someone is jerked off through a velvet crown royal bag, a bag commonly used as a dice bag by dungeons and dragons players. The sex act its self is referencing an item from dnd called a handy haversack (basically a lesser bag of holding)
Frank: How was dnd last night?
Bill: Dude! Jenna gave me a Handy Haversack after the game was over!
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."