'Slag' (dog,devious,untrustworthy,grass) 'Boat' (face)
A slaggy boat. Somebody considered untrustworthy, reguarly pulling snakey moves on friends and just generally being a c*nt. Hangs about with gangster crowd pretending to be a drug dealer type but never sold a penny's worth.
That paul's a right slagboat - I've got no time for the geezer.
John, you cheeky fu*king slagboat wheres my puff?!?
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.