Gerbilization 

the horrible act of inserting a live gerbil into one's anus for sexual pleasure.

Sandra: "What would u like to do tonight, bob?"
Bob: How's about some gerbilization?"
Sandra: "O.k."

Gerbilization by myob December 16, 2004

Interanal Gerbilation

The act in which a tube is shoved into a man's ass and a gerbil let loose inside. The bewildered animal will crawl through shit and eventually tickle the man's A spot, sending him into orgasm. A gerbil may later be extracted by shining a flashlight into the rectum. Note: Always wash your gerbils.

Anyone cruel enough to subject an innocent animal to interanal gerbilation
needs to be shot.

Interanal Gerbilation by Anonymous June 13, 2003