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When a woman goes down on her man in a movie theatre and they're the only ones that that row. To someone who's just spotted them, this person would see two heads, then one head, then two heads again, thus: two-one-two
I walked late into my movie and noticed that I wasn't alone, there was a two-one-two going on up in the last row.
by Nazim April 20, 2008
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