Top Definition
1)A nasty un-wiped dirty bottom.

2)What happens to the trunk of the male penis as a result of intense anal sex and or during the menstrual cycle.
Yo, that bitch has a rusty trunk. I banged this girl last night at that party. She didn't tell me she had her period, now i got a rusty trunk.
by DrunkProof August 25, 2009

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