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A term used to describe catching a member of the opposite sex in the act of checking you out. Yellow flagged is a reference to the referees in football throwing a brightly colored yellow flag when a player is caught breaking the rules.

Invented Boise, ID, 2002
Bro, I totally yellowed flag that girl checking me out. Or: dang it, the girl just yellow flagged me staring at her breasts.

As a noun: Oh nice, I just caught a yellow flag from the chica over there.
by thegenoshow March 03, 2011
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