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!
A very cool person who has an excellent style sense and wears a trench coat. If you are a trenchie you should be very proud as it is the greatest compliment and being a trenchie means you are the coolest person ever.
'There's a trenchie.'
'Oh wow, I wish I was a trenchie'