Quote Originally Posted by Barmaley
Lingvo lists it as "• валять дурака — to idle." You could also use more colloquial expressions like "to mess around," "to dink around," "to lie around," etc., just like Misnomer said.
"Dink"? That's not something I've ever heard.

"Goof off" sounds more sexual to me than "mess around". Neither of them sound very sexual to me.