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1.
The act of heterosexual man-flirting, a man expressing effusive admiration for another man without sexual intent but using many of the techniques of romantic seduction. Common between skilled orators and people-watchers. A great way to break the ice if it's not misconstrued.
"It was a classic chap-up line".

"He took me outside and proceeded to chap me up outrageously."
by Mikeachim March 12, 2012