Grundle Bump

To bump one grundle against another, much like scissoring between two people, but can occur between any gender mix. It can occur in rapid succession.

Last night we got hammered and tried to have sex but we just ended up grundle bumping.

Grundle Bump by The Realest June 16, 2017

Grundlebumpers 

A male rubbing ones own grundle with another males grundle, behavior closely associated with two males giving up sexual realations with women to play " word of Warcraft " or " Aion "

Matt and Greg are the biggest grundlebumpers in the world!!! They would rather play Aion then go out and get laid

Grundlebumpers by Imperial18 October 2, 2009