Top Definition
A Cupboard rat is a rat that seemingly lives under your sink, and will hop out to snag any scrap that falls on the floor. you can buys the cupboard rat and cupboard rat XT at your local wal-mart for $500.
Me: Throws a pizza scrap on the floor...

Cupboard Rat: Hops out and snags the scrap quickly bringing it back to its cave and devouring it.
by BootsTheKitten November 30, 2010
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