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When three guys are blowing each other at the same time with one man on his back, one on his side, and one on his stomach. Pen15 is a more childish way to write 'penis' and Triange refers to the way in which they would be laying.
I heard Jenny recorded Bill, Tom, and Greg doing The Pen15 Triangle.
by 1:35_in_the_morning June 12, 2017
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