Someone who might put up a front or appearance to be down or all for what's going on, only to back out from some "random occurence" or "seriously" legit reason.
Bello: Hey Lisey what's going on, are you coming out tonight?
Lisey: Nah sorry I can't my toe hurts and I don't feel like walking
Bello: Come on you've been saying you'd come all week and now you're backing out?
Lisey: Yea my thumb is killing me I can't even move it
Bello: I thought you said it was your toe
Lisey: Yea, I got to go