OP is a fag. Basically a phrase used in /b/ to pwn someone who's asking for the name of a movie after posting a picture of it.
OP: YOU GUISE YOU KNOW WHAT MOVIE IS THIS GIF FROM? ILL DUMP PR0N IN RETURN
Anon: It's from Opies a flag
OP: OH THANK YOU SIR
OP (minutes later): WAIT, I SEE WHAT YOU DID THERE...
Anon: It's from Opies a flag
OP: OH THANK YOU SIR
OP (minutes later): WAIT, I SEE WHAT YOU DID THERE...
by Mr Winters October 16, 2009