Someone who is close to being an a1 bloke, but due to some mental difficulties, not quite.
Adam: "Awwh bless him, he tries so hard, his hearts in the right place but his head's screwed on fucking backwards".
Chris: "Yeah, what a 1a bloke".
Abreviation meaning 'Fit From a Distance'.
Dave: Oh man, that girl is amazing!
*Girl gets closer*
Adam: Naah dude, she's nasty! Definitely an FFAD!