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!