Taking an excessively long drink from a bottle of hard liqour - the point being to "out pull" the other drinkers taking turns at the bottle. At least 2 others in the circle have to suggest the puller stop drinking out of concern before the pull officially qualifies as a tractor pull.
Occasionally, the others in the group will stop the tractor pull, before the puller "blows his engine."
"Damn why is Shane so wasted already?!?"
"Dude, you saw those tractor pulls he was doing!!!"