A close friend who aids you in the pursuit of pulling a female on a night out.
Similar to a wingman, although Fanny Saddler is a gender neutral term.
A Fanny Saddle can aid in the pursuit of both straight and lesbian sexual relations, but only when attempting to pursue a female.
"Hey Col mate, could you be my Fanny Saddler tonight?"
"Course I can Babs, I'll saddle it, you ride it"