The act of making out without any movement. The couple simply sits there and engages in movement of the tongue. To stfooj one must never move the lips, head, hands, or body. It is a particularly akward-looking and disgusting act and is certainly NOT advised!
Guy #1: Susie and Bob make a pretty cute couple, don't you think?
Guy #2: Ew! No! last night were just stfoojing on the couch for hours.