A variation of the mushroom stamp (slap), where one's penis is covered with semen and/or residue left over from a good anal sex session. The icky is the semen and/or residue, the thump is the sound of the stamping (slapping) penis.
Sally was a little agitated after I gave her the ol' icky thump, but after another go at things and a shower she piped down.
by Tubbo July 16, 2007

It's what you call your soda after a little kid drank from it and slobbered all over the can or bottle.
by Paul Gremlin July 24, 2008

by BUMP3r December 25, 2019

by Daniella (: October 28, 2008

by sq_nuts November 12, 2022

It can be an adjective to describe something stupid or uncool.
It can also be an action verb used to describe shitting or farting.
Created by Alessandra Irene Maines 2023
It can also be an action verb used to describe shitting or farting.
Created by Alessandra Irene Maines 2023
by Allymay25 February 21, 2023
