gunsmack 

gunsmack

Gunsmack: To one-hit some chump from behind, especially with a firearm.

"That shitbag was hitting on my bitch, so I gunsmacked pistol-whip sucker-punch him and took his wallet. Thanks for buying the Colt 45, asshole."

gunsmack by egocentral1 January 1, 2014

gumsmack 

Cheese that builds up in your butt crack.

The gumsmack was so thick I couldn't handle the 69.

gumsmack by dirtball November 4, 2003