Definitions by T-Pab

viper 

Whilst an unexpecting victim is standing, or more preferably bending over, another person approaches with index and middle fingers extended and sinks them into the man's grundle/gooch/taint and proclaims victoriously, "Viper!".
A very painful and startling move that must be executed with precision otherwise the awkward, "why did you just stick your fingers in my ass you fag?" will surely follow.

"So this douche was bending over tying his shoes, and I went over and gave him the worst viper in the world. He actually jumped over the bench he had propped his foot up on."

viper by T-Pab September 13, 2006