Congenital brother is a family member who aquired your DNA after kissing (or making out in any of its forms) an individual who has acquired you "amino acids" via oral sex.
Dany: welcome to the family, you're my new congenital brother
Stefan: ???
Dany: that skank you hooked up with was carrying a mouthful of my genetic code
Stefan: ???
Dany: that skank you hooked up with was carrying a mouthful of my genetic code
by bergali September 22, 2010
Get the congenital brothermug.