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1. PURE EVIL
2. A ball of fluff that procreates rapidly and drains an entire species of resources until they collapse. The species does not notice because the tribbles are "cute."

3. Parasite, abomination
The tribble was taken onboard the ship of unsuspecting idiot Earthlings who figured it was a cute pet. THEY WERE WRONG.
Tribble by Appayipyip42 July 1, 2011
A mysterious formation of matted hair which periodically collects on the surface of one's bathtub or shower drain.
"What the <beep> is that!? Oh...it's just a tribble."
tribble by M1LESperH0UR September 19, 2012
To receive a blow-job from three girls simultaneously. A portmanteau of the words "triple" and "blow job".
Last night was wild. I got a tribble from three sevens. They also licked each other's pussies. I'm going for a quibble next time.
tribble by hatnyc2009 January 27, 2009
When a large selection of food/Ass is presented and you wish to "TRY" a "NIBBLE" of everything (i.e Sampling)
"yeah, dude..I'd tribble that"

"why thank you darhling, I most certainly would love to tribble your lovely party snacks! My ohw my what a wonderful selection!"
tribble by kiwinky December 9, 2008
the fat that is squeezed out of the top of your jeans.
eww...i can see her tribble through her shirt!
tribble by rachellybarclay February 15, 2009

Tribble Effect 

A phenomenon that occurs when in Star Trek Online, someone pets their tribble, and others nearby proceed to follow suit.
I went into a crowded space, and petted my tribble. Nearly everyone else nearby who had a tribble petted theirs, as well. Thus, the Tribble Effect.
Tribble Effect by B33R Train June 10, 2010