When your girlfriend or boyfriend (whatever preference may be) walks by while reaching out to bump your crotch with their hand. Not to be confused with a grope, it's just a quick tap, to let you know they're thinking of the guy downstairs.
We were just cleaning house and all of a sudden she walked past me and gave me a junk bump... then it was time to clean naked!
by Naughty lil French Maid July 08, 2009
When a girl intentionally bumps up against a guy's junk either to check out his package or see if she can get a rise. Supposed to seem accidental or not be noticed at all like she did so unintentionally.
by Teera February 09, 2007