When you wake up from sleeping and u were sleeping on your arms. You therefore have absolutely no blood in your arms and they are immovable for about 15 seconds just like a penis.
Dude yesterday i woke up with penis arms. It was the only time ive actually not been able to move sumtin on my body because if it being numb!!11~!one!eleven!!
by The Family Guy October 07, 2004
a guy with viens sticking out of his arms
the guy who uses steriods has penis arms
by mari0 August 18, 2003