FTB

Stands for Fuck That Bitch. A term that is used when one is angry or annoyed at another person.
Angryannoyed

Person 1: Did u hear wut Kia said bout u?
Person 2: what
Person 1: she said u got clemidia

Person 2: ftb. Her toe got clemidia

Person 1: lmao whut
Clemidiatoe