its a sexual position, involving 2 women and 1 man. It is performed in the standing or laying on ones side position. the man is inbetween the two women, and has a strap on strapped to his backside. Then be proceeds to 'do' both women, and the forward and back motion establish the saw part of the word, whereas the erect penis relates to the bone part.
So everyone knows that girls do have facial hair...but most of the time its sparse or light enough where its not noticed, but what do you do if theres a really hot girl but shes just got this hairy hairy face...well u provide a service to the world and give her a texas shave....it goes something like this...
you and ur hairy, but hot lady friend proceed to do the dirty, and being the ingenious partner in the relatioship, you proceed to bust on the girls face, and well spread the semen around and then give her a shave, of course you placed a razor within reach before any thing went down.
her face was soo smooth after i gave her that texas shave.