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1.
the hamster version of masturbation
even though they are actually cleaning themselves, it looks more like they are pleasing themselves
Bruno: Hey man, what in the world is your hamster doing?
Alfie: Oh, don't worry about it, he's just hamsterbating.
Bruno: Gross man, you need to get him a woman!
by Hamster man November 11, 2006
 
2.
the act of helping a hamster masterbate
"I had to start hamsterbating my pet hamster. He can't do it himself on account of his tiny arms and lack of thumbs."
by reaverandatlas May 05, 2010
 
3.
a hairy person who masturbates
Rememba when Pat was caught by a security in da bathroom for jacking off?
-His hairy ass, dat man was hamsterbating!
by Tugboats June 11, 2006