look up any word, like eiffel tower:
 
1.
Crushing someone elses head in between your buttocks.
We were going to shoot him, but we decided to perform a gremline instead.
by UbEr1337gUy January 18, 2007
 
2.
The act of crushing someones head inside of your butt.
"Gremline!"

"MMF!"

"FATALITY"
by UbEr1337gUy January 14, 2007