Top Definition
When a man tucks his ball sack into his anus, slightly resembling the Firefox logo.
"I gotta go wash my balls, me and Shelly were Firefoxing last night"

"Jack sat on his bicycle at a funny angle and accidentally Firefoxed himself"
by firefoxballsack1992 August 14, 2008

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.