I don't know what the F*** that means but anyway...
I think the words say it all, but basically, when there is something you completely don't understand, but don't care to take the time to understand it.
Umm, I have no idea what kind of situation i could give an example of... How's about: A nerd tells ya some stuff about computers that is too freakin' complicated for any non superbrained human to understand. So you say: Idkwtftmba!
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."
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.