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Refers to the person who makes the next post after the Original Poster; the very first replier to a forum thread. So called because it's the next one on from OP.

The pattern can go on for as long as you like, OP+2, OP+3 etc. but when it gets too high to interpret at glance, it's probably not worth using.
The OP+1 is fuckin' troll, someone please ban him.
by Atomik Spongeface June 20, 2008
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