This phrase was originally used in the context of a guy hitting on a girl or vice-versa. Since it's conception, however, the phrase has been extended to include many other forms of action not necessarily related to dating rituals. Example: Check out Dave talking to Kelly. He's really working the biscuit.
WORK THE BISCUIT
Meaning of WORK THE BISCUIT in English
Slang English vocab. Английский сленговый словарь. 2012