If a girl is having sex with one guy for an extended period of time but are not dating, and he goes home for the weekend, she resorts to her side pipe. This is a guy that she has banged before, but has not lead anywhere, and she keeps him on the back burner when needed.
by UVM'sfinest March 29, 2016
When a fellater moves to a side position on the cock to avoid getting a mouthful of jizz. see also "harmonicock"
She was not a lover of spunk but did not want to disappoint her lover, so she used the side-piping technique to take him across the finish line.
by jpsidepipe October 4, 2010