FrankDaTank2009's definitions
While having a 3-way, the man lays down on his back, and one girl starts riding him cow-girl, and the other sits on his face and the man eats her out, while the two girls make out with eachother, viewed from the side it looks like a triangle
by FrankDaTank2009 October 17, 2009
 Get the The Trianglemug.
Get the The Trianglemug.