"Winger" is used as a closing in a letter, and is an abbreviation of "Your Wingman" which implies a pledge of both friendship and fidelity by the sender. Similar to the use of "Huckleberry" in the phrase, "I'll be your Huckleberry".
When used as a goodbye between two people, i.e. when "Winger" is spoken, it is common to gesture by forming a "W" by holding both hands up in front of you at chest level, extending only your thumbs and pinkies, and putting both thumb tips together so that it looks like a "W".
Tony,
Thanks for the advice!
Winger,
Mike
or
"Hey Tony, I gotta run, but I'll see you later today at the party. Winger" (while making the W gesture)
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