penis popping

Flexing your penis when you have a boner so that it moves up and down.

Dude watch me lift this book on my crotch by penis popping

penis popping by Poot man February 4, 2010

Penis-Propping 

Propping up the flaccid penis of an unconcious male, using such objects as popsicle sticks and medical tape, so as to have sex with said unconcious male

Jonny B. was penis-propped in his sleep, but woke up horrified in the middle of the act.

Penis-Propping by William McMilliam July 23, 2005