One who amongst your circle of friends is commonly known as a lesser person, often humorously scorned in passing, yet not worthy of lengthy thought.
"Oh look everyone it's Alex Trebek. Hey Alex, ya beef witted apple john! What's the difference between you and a bird with a cold? One's a sick duck...anyways I don't remember how it ends but your mother's a whore."
Someone with the intellectual capacity of a cerebrually defective cow and the mannerisms of a parasite.
In other words, an idiot who leeches off of other people's resources without contributing anything in return.
In OTHER other words, the bad funcle and your 26 year old cousin who lives in their mother's basement.
Also used as a general insult when someone does something stupid.
Jimmothy: *spills the tea kettle on Pathew* Whoops Pathew: OW wtf Jim! You beefwitted barnacle!
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."