When a sick cunt does a hectic skid and gets a bunch of rubber all on his rear fenders.
Sick Cunt 1: "OOFT CUZ! That was a fully sick burnout ay!?"
Sick Cunt 2: "Yeah bruz, oh fuck mum's gonna kill me aye!"
Sick Cunt 1: "Why????"
Sick Cunt 2: "There's Tyre Slap all up the quarters of her Ford AU Falcon!"
A tip-in (not to be confused with Tip in where it's about sex) is a hoon maneuver where the driver is doing a burnout, and slowly lets off the brake to gain speed then quickly turns the wheel to full lock to one side, and hold it to whip the rear around while staying on throttle to add more flair to the skid.
Hoon: "Brah watch this tip-in, it's gonna be fully sick!"
*tip-in*
Passenger: "OOOHH LAD THAT TIP-IN WAS FULL ON HARD!"