OB is short for "Ownage Bitch!" it usually has a hand motion accompanied with it. An "O" is formed with the middle finger and thumb, then, the index finger is rotated up and down so the "O" becomes "B", then back to "O," and so forth.
"i owned you OBOB"
"we pwned that shit yo OBOB"
"you got OB'ed"
"what's that on your shirt? (looks down, sees nothing) OBOBOB"
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