Posted by Scott on July 19, 2007
I'll try to ask this one as politely as possible. (Moderator - please remove if you think it'll cause offence, but I see the f word used below so I think I'm OK!).
Middle For Diddle - commonly meaning choosing the middle option, or used to decide who starts a darts match by getting nearest to the bullseye.
It has been suggested that the origin of this is quite rude, referring to a woman's anatomy along the lines of (rhyming):
Front for ****, back for cack, middle for diddle.
Can't see anything remotely suggesting this on the Web and would be fascinated to know!
See also: the meaning and origin of 'Middle for diddle'.