Top definition
UPG stands for Unsolicited Penis Glance. This occurs when a man is in public or a semi-public place and he witnesses or is informed of someone who has glanced in his general crotch or groin area.
Amy: Why is it so easy to catch men who stare when a woman is wearing a bikini?

Bill: Don't act like you don't do it with our speedos.

Amy: Yeah, you're right. I just love to ponder about what might be under those things.

Bill: I know, I caught you doing a UPG just yesterday.
by E.F. Tymac April 19, 2012
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