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1.
1. One who lives in the anal cavity of another individual. These organisms never leave the host's anus, as they obtain their nutrients from their habitat.
2.An annoying animal or person.
I can't get rid of my god damn ass critters!
by CJAH April 21, 2004
 
2.
A small animal or child of extreme annoyance.
Manzo's god damn ferrets are major ass critters.
by MPC November 03, 2003