A fun and challengingsexual activity involving two men. One man inserts his penis inside his partner's anus. The catcher than clenched his anus as tight as humanly possible as the pitcher drags him around the fraternity house.
Hey bro, did you see Chad and Larry tractor pulling last night? They set a new house record of 17 meters. It was fucking epic!
Often seen as as a derivative of the Idaho Ratio, the Tractor Factor represents the correlation of one's "presence" to the size of their tractor. In common usage (see example #1), the Tractor Factor is used to judge the size of one's tractor by their "presence". Conversely, the Tractor Factor may be the judgement of one's presence by the size of their tractor (see example #2).
Example #1
Bro #1: Man, that guy has a HUGE Tractor Factor.
Bro #2: Yeah, bro. He must be packing one hell of a tractor.
Example #2:
Bro #1: Holy shit, that tractor is very small.
Bro #2: Damn, the owner's tractor factor must be tiny.
Bro #1: F.