a sketchy, creepy, suspicious looking person. Usually a man.
Girl 1: That guy has been following us around the whole time
Girl 2: what a fuckin trenchie!! lets get out of here.
by valeuchick June 13, 2008
Trenchie - Noun - An individual that is a fan or a groupie of the Canadian band Marianas Trench.
I'm a Trenchie for life!

Look over there, they are wearing Marianas Trench gear, they're a total Trenchie!
by JeniferHxC July 01, 2010

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