Peeking Rat 

The tip of human stool that protrudes from the anus because it can no longer be held back due to pressure in the bowel.

Rex: Man I gotta take a crap so fucking bad after that huge lunch.

Sam: Bummer man, you got a peeking rat?

Rex: Oh yeah, the rat is definitely peeking. I'm gonna go find a bathroom.

Peeking Rat by drkato September 3, 2009

look like a rat peeping through a hedge 

Has a large unruly beard.

Liverpool (UK) slang

Get a shave, you look like a rat peeping through a hedge.

He looks like a rat peeping through a hedge.

look like a rat peeping through a hedge by Albert Stein February 6, 2008