Top definition
The act of inserting a live gerbal, hamster, or other small rodent into one's anus for sexual pleasure.
"dude, my neighbor had those PETA fags knocking on his door and yelling becase he had a rat up his ass."

"yeah dude, he was gerballing."
by Spooky Brown January 27, 2010
Get the mug
Get a Gerballing mug for your buddy Jovana.