When the driver is on a date and pretends to stop short in an emergency situation, hence putting his arm out as if to stop the passenger from flying through the windshield. But what he is really doing is feeling her boobs...
When the human waste comes out too soon and leaves a brown "track-like" looking shitstain on the inside of your momma's panties. It can also be found on the inside of a toilet bowl when your bastard, son-of-a-bitch brother drops the bomb.
Son: Daddy what are the brown marks on mommy's underwear?
Dad: Wow your a dumbfuck, those are your mother's shitstain tire tracks.