A father baby daddy is the daddy of a baby daddy. A father baby daddy often tries to sleep with his baby daddy son's baby momma, on occasion resulting in another baby and creating a true level 3000 father baby daddy, who now has two baby daddy sons, a grandbaby, and a baby mama mistress.
A term used when you don't know who your baby daddy is and it could be any/all of the guys at your school because you slept with just about all of them.
Melissa: I'm pregnant but I don't know who it is...
Ryan: Well maybe you should have had all those one night stands with those guys!
Melissa: It wasn't that many...
Ryan: You slept with almost all of them, it could be any of them... You have Angie's Baby Daddy!
also known as FBDS, the guy you screwed around with and had a baby with for the first time, mostly affects young girls from ages 14-19 years old who have kids extremely young and before marriage.
Lindsay: I really might get back with my ex
Bobby: why he's a total douche to you and doesnt even care about lil jonny
Lindsay: because he's my first baby daddy!
Bobby: ah! fuck girl you've got a case of First Baby Daddy Syndrome!