Top Definition
A term popularized by the video-sharing site youtube.

This term means that somebody/someone or something isn't working, or functioning to their full capacity.

This can be used as a synonym for MIA on aim or msn.
1) www.youtube.com: "we're updating now, but we'll be 100% back in a bit"

2) Bill: Dude, are you OK? You don't seem yourself..

Bob: Yeah, I've kinda been not 100% this week, ya know?

3) user1: hey ima b not 100% 4 a bit

user2: its all good
by vic_j_orl May 24, 2009

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