The log driver is a sexual act that involves a woman or man, lying on their back, with their legs over their head, and spreading their eager buttocks open with their wanting hands. "The logger" then sites on the mN TOans or woman's buttocks, and defecates, or drives a log, in to the man's/woman's cavity.
"I brought John home last night, and he logged drived the shit into me"
"I went out dancing with Rick last night, and then when we got back to my place, we did the Log Driver's Waltz. It was different."