The act of brushing one's anus with someone else's toothbrush then putting the toothbrush back where it was.
My roommate wouldn't quit hitting on my girlfriend so I gave his toothbrush the ol' cavity creep.
by Ehrensusedtp February 16, 2011
1 more definition
Someone who has bad teeth.
Eww. That cavity creep tried coming on to me.
by Robert MacKenzie August 29, 2005