One who steps in and blows a guy for a friend because she is in debt to the guy she's blowing.
(friend #1) "I dont know what to do! this guy gave loaned me money and I cant pay him, so now he says im in debt to him for lots of blow jobs!!"
(friend #2) well dont worry!! Ill help you! I will stand in for you, just call me your "stunt blower"!