any female (or girl if you will) who will blow just about anyone
Also, any girl who simply loves to suck d*ck like a grimey whore.
Note: Blow pigs can be sloppy, overweight, AND/OR ugly BUT when getting a BJ, especially from an experienced blow-pig, WHO REALLY CARES ANYWAY!!
Guy 1: Yo dude, check that girl out over there, she looks like a real blow pig!
Guy 2: Yeah man, i bet she guzzles buckets of cum in her spare time. You can tell shes just asking for that guy to stick his d*ck in her mouth.
Guy 1: F*ck yeah.