When someone makes an awful joke or references something which no one understands, so the group of lads say "Gud 1 Jan" in order to show that it was incredibly dead banter.
"Why did the console peasant cross the road? To render the buildings on the other side."
"Gud 1 Jan"
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the USCoast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."