noun; German in origin, a Sidewing is very similar to the more common and American "wingman." Common circumstances when it's good to have a sidewing include (but are not limited to): beer pong, intense soccer or football games, and awkward situations. A sidewing never "heads over" or "cruises over," but instead "slides over." Though the German pronunciation may be harsh and barking, one musn't fear; it is a term of affection, a position of honor.
Shit, we're losing. Where is my sidewing?!

Guy 1: "Hey, I think we might need back up for this."
Guy 2: "Don't you worry. My sidewing is sliding over now."
by Koenig Jakob December 2, 2009
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