Guys know this happens all the time in the club its everywhere. There is always that one chick thats dragging the rest of her friends around or away from others guys.
(non-Gender Specific) When a girl is in between two men. The guy in front is receiving a hand-job and leading her forward while a man is pushing her forward in her vagina or ass;
or,
when a man is between a woman who tugs him forward teasingly with a blow-job or hand-job and a man (or woman with dildo) pushes from behind in his ass.
"Last night Mellisa was sucking teasingly and James was driving me from behind. It was the best Tug-boating I've has in a long time.
The art of masturbating by looping a rope overhead, attaching one end to your junk and then pulling on the other. Mimicking the sound of a tugboat's airhorn throughout is recommended for maximum enjoyment.