Being "Hit like Tyson" means that the girl doesn't sleep around a lot. She has only been "hit" by a few different guys.
The fighters that fought Tyson typically only took one or two punches before being knocked out. There were only "hit" a few times. A girl that has been "hit like Tyson" should be safe and not carrying any STDs.
Brad: Damn, that girl over there is a dime.
Homewood: Hell yeah, and she has been hit like Tyson so you know you won't be at the free clinic on Monday wondering what is dripping from your cock.
7👍 2👎