When you get in the middle of two objects.
After I got betwinx her thighs, she was fucked up like hogans goat.
by catslaughterer May 28, 2010
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When you see some really, large breasts that you would like to put your penis in between. Doing so also resembles, a TWIX bar.
I put my penis in betwinxed her very large breasts, and admired it from afar... thinking of all the different food items it resembles.
by Legendary Slooch January 24, 2012
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