Definitions by .Anonymous.

backy

A person who changes his or her mind at the last minute, stopping another friend doing something. (see backied)

Person 1: I was going to go to the party but now John says he cant take me
Person 2: He's a backy...

backy by .Anonymous. June 25, 2005

A change of mind which affects a friend/associate and leaves them 'stranded'

John was going to take me to the party but he backied

ie. he changed is mind