1 definition by Spooky Brown
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."
"yeah dude, he was gerballing."
by Spooky Brown January 28, 2010