tiny tap 

When a man is hit in the testicles by a small object (usually a fingertip) with a force that appears misleadingly small to do damage, but in fact inflicts nearly as much pain as a blow of proportionately much greater force. Most females are unaware of the effects of the tiny tap and are often reluctant to accept its existence and the damage it is capable of producing.

Dude, my gf just tiny-tapped me and she doesn't even believe it hurts... tell her the truth man. Tiny taps are not a myth.

tiny tap by nutmythbuster May 1, 2010