an act in which your arm sticks straight out, thus making your elbow un-flaccid: an elbow boner, short for elboner. Similar to a kneerection, which incorporates your leg.
"Oh, look, Will has an elboner again, and all the girls can see it."
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v. To use then get rid of
Cameron: Dude, I heard about you and Rose, that sux
Drew: Yah she totally elboned me!
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To fuck a girl with your elbow.
My wrists were getting pretty tired, so I switched to some aggressive elboning.