A plumber's term for a flushed tampon, after having clogged a drainpipe for some time, the tampon collects clods of hair and other refuse, causing it to resemble a dirty furry thing with a tail.
I wish these bitches would stop flushing their goddamn tampons.. if I have to plunge for one more sewer mouse...
by DP666 June 11, 2006
Get the sewer mousemug. A used tampon, generally that which is found through plumbing work, but also can be found anywhere after discard.
I found a sewer mouse in our hiding spot in the park. Someone must have been earning their redwings.
by dadafari December 22, 2008
Get the sewer mousemug.