Top Definition
A person who starts doing drugs and joins a group of people who are heavily into that drug(s) already. Then after a short while, leaves the group because they can't keep up with the group's high level of partying.
Joe - Hey Keith, who's that kid who was at your apartment last night in the corner tweaking out?

Keith - Oh, thats just some interlooper we met the other day. He won't last long partying with us.

Joe - I hope he doesn't od trying to keep up with us.
by Hopie Elle March 17, 2008
4 Words related to Interlooper

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