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A babinav is a guy (usually a kid) who leaks milk nonstop and never gets knocked up. He's not a total loser, but he should help others by spilling his juice on their faces.
My cousin is a babinav. He leaks milk during class and won't stop.
This babinav tried to hide his milk in a cup. It exploded.
He called me a babinav. I called him a f***ing cow.