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1.
Felines that breed rapidly and over populate an area. Like cockroaches they are to many in one place.
The catroaches multiplied quickly and swarmed the house.
by jpg3 January 10, 2013
 
2.
An indoor cat that spends most of it's time hidden and is only rarely spotted. Much like a cockroach.
"Have you seen the cat?"
"That's not a cat! It's a cat roach. It only comes out to feed!"
by Ms_Firebrand March 28, 2012