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military slang
short for 'Open Fire InterAction'
is often used in muliplayer online games and in a brawl or fight too
Player1: "Can you get here and give me sniper cover?"
Player2: "No. I'm in a OFIA myself."

Classmate1: "The teacher hates me."
Classmate2: "Yeah, she's totally OFIA on you."

Dunkard: "You say more and i'll get OFIA on you."
by HaSoe October 01, 2012