look up any word, like guncle:
 
1.
Used when a person raises their hand for a high five for acknowledgement of something that isn't worthy of laughter, praise, or pride.

Accomplished by a third party, on either side or behind the offender, high fiving the back of their hand in a slapping motion. This removes the offender's hand from the air, quelling the awkward moment and removing any chance of a pity five.

Ultimate form accomplished by a person standing directly in front of the offender.
Jordan: I heard Nick kept making jokes about women the whole time at the pub last night while you guys were with your girlfriends.

Chris: Yeah but luckily he tried to go up top after one of'em and Korey pulled a reverse high-five on that shit. Everyone laughed and he tabbed out right after.
by VoodooJoe December 06, 2011