Occurs when a woman is performing MATM (messy ass to mouth) and is so disgusted that she pukes on the man's dick. The resulting mix of shit, puke and semen, typically covering the man's dick, is called a Pinette Scramble.
He jammed his dick down her throat at the moment of climax. His shit covered cock was too much for her. She barfed on his cock resulting in quite a Pinette Scramble. Of course he used her hair to clean up.
A pipette job is given by a rare and gifted individual in the laboratory setting. The three stages of a good pipette job include 1. wetting the rim, 2. insertion of the pipette tip and beginning graceful movements up and down, and 3. pipette ejaculation, occuring at the same time as the final thrust of the hand giving the PJ.
"Jessica gives the best PJ's in lab, although Anthony comes in at a close second when giving a pipette job to male cells"
or
"Tris, you PJ'd the fuck out of those cells and made them break up."