Someone who has succumbed to the thots. This person will often abandon his friends, ignoring them and won't talk to them for months.
Bantawigs disease is a non-contagious virus that occurs when one gets a girlfriend.
Jackson: "Yo, Tyrone, where has John been the past couple of months. He doesn't hang out with us anymore"
Tyrone: "Yeah, that nigga John, he has Bantawigs disease."