A very young girl, usually 12 or younger. The opposite of a Cougar. Made famous by the 4/11/09 episode of SNL.
Geoff: Dude, those gerbils over there are totally checking you out!

Greg: Gross dude. Why are they letting gerbils in bars now?
by Grampa Farts Pants April 12, 2009
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The opposite of a Cougar, usually extremly underage in the situation, but extremly hot.
Two guys in a bar, a really young underage girl walks in.

Guy 1: Dude, check her out!!
Guy 2: Woah, she is... really young...
Guy 1: No duh, she is a major gerbil!!
by Oakieman May 25, 2009
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The opposite of cougar.
This was made up by SNL.
"Watch out guys, they're Gerbils."
"What's a gerbil?"
"The opposite of a cougar."
by SnL13 April 12, 2009
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Small Seizurey Mammal who watches sexual acts of unspeakable horror
That gerbil was all seizurey, & uh stuff
by Gerbtaro April 26, 2003
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Most amazing cutest animal of them all which must not be used in the art of bum fucking
by Charli April 21, 2004
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Having a live rodent or small animal (usually a gerbil) and using some sort of tube, forcing the gerbil into ones asshole. No medical case has ever been recorded of someone needing to remove a gerbilfrom ones anus, so we must now come to the conclusiion that either
a) gerbilling doesnt exsist.
B) they are very good at getting the thing out afterwards.
Gerbilling has many famous cases, such as richard gere reportedly having a wild session with the furry animal.
For more information i recommend the south park episode "Death camp of tolerance" which features rather detailed examples of gerbilling.
The hidden line in the song "i will do anything for love".
I will do anything for love
but i wont do that
no i wont do gerbilling with you
no i wont do that

.......

"Im bored, what should we do tonight?"
"I dunno, how about you shove that gerbil up my ass, wait for it to wrigle around and maybe die, then you can pull it out."
"So whats on TV again?"
by Russell Wilson September 20, 2005
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Slang, used to describe a very cute girl, which is not to be confused with a hot girl. And cute, though she is, like her rodent counterpart, she likes to have a lot of sex.

This fact is only known either through personal experience, or the account of a close friend.

Said with annunciation in most occasions such as: gerrrrrbull.
A: Man, you'd never know it, but Justin's girlfriend is a gerrrbil.
B: Yea man, she likes to get f*cked.

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A: I'm gunna find me a gerbil tonight.
B: Yea, playa, tonight we goin gerbil stompin.
by Ayyo Blake February 13, 2007
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