The act of getting a tattoo of a genital on your forearm. Then rubbing said tattoo against your partner's forearm, which has a tattoo of the opposite genital on it. Made popular by the television show 'Hotbox'.
Beware, if your son or daughter has a tattoo of a penis or vagina on their arm, they may be tatscrewing.
by Robbiedoo October 5, 2009