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1.
when two males place their erect penis's head to head, and pull the others foreskin over the tip of their own dick.
craig: im tired of givving and taking it to the ass
alex: excatly lets pipe fit tonight
by kirkels May 30, 2005
 
2.
The act of stretching one's penis opening wide enough to allow entry to another penis.
He and his gay lover practiced pipefitting.
by titus hohl January 16, 2003