pipefitting 

The act of stretching one's penis opening wide enough to allow entry to another penis.

He and his gay lover practiced pipefitting.

pipefitting by titus hohl January 16, 2003

mouth pipetting 

Performing oral sex, especially on a scientist or laboratory worker

The attractive female lab tech asked about the dangers of mouth pipetting and if she was at risk to accidentally inhale the DNA sample she wanted to collect

mouth pipetting by DrHyde November 5, 2010

pipe fitting 

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

pipe fitting by kirkels June 5, 2005

mouth pipetting 

1. Using one's mouth to precisely transfer liquids using a pipette.

2. A very accurate but Darwinistic way of measuring liquids due to the possibility of swallowing chemicals.

Bob was the most precise lab tech around because of his controversial use of mouth pipetting. Unfortunately this is now on his tombstone because the retard drank acid.

mouth pipetting by your mom sucks me hard September 2, 2009