When you're cuddling laying down face to face with someone, and you don't know where to put your arm...as it sits awkwardly between you two.
"I have the arm again."
by gilmoregirls23 February 04, 2008
A condition in which the person's arms resemble cottage cheese.
Looks like that Jennifer girl's got a mad case of the arms.
by The Miscreant October 28, 2007