To get Crabtree'd is for a man to become infested with pubic crabs, to such an extant that his penis looks like a tree of pubic crabs, a "Crabtree."
Aside: This usually happens after an individual is too cheap to pay for a clean prostitute.
Man, my friend Bryan bought a $10 whore last night and was Crabtree'd bad.
To get extremely drunk and off your face.
I say Harold, that many over there is Crabtree'd.