baby daddy
noun
slang
: the biological father of a woman's child
especially : one who is not married to or in a long-term, intimate relationship with the child's mother
Near the end, a very pregnant Sara watches as her baby daddy cozies up to a new girlfriend. 
Jessica Heslam, Boston Herald, 16 Jan. 2010
Jessica Heslam, Boston Herald, 16 Jan. 2010 
Word History
First Known Use
1993, in the meaning defined above
- amphibion
- amphibiontic
- amphibiotic
- amphibious
- amphibiously
- amphibiousness
- amphibiousnesses
- amphiblastula
- amphiblastulae
- Amphibola
- amphibole
- amphibole group
- amphiboles
- amphibolia
- amphiboliae
- amphibolies
- amphiboliferous
- designee
- designees
- designer
- designer drug
- designers
- designership
- designful
- designfully