Pronounced 'goan''bag', similar to nadsack, derived from the gonad and a carrying device , such as a sack or a bag or a satchel. Basically its a scrot.
'carl, put your freaking gonbag away'
or
'dude, lash ur gonbag out and get this party kicking'
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."