A person whom when viewed from an
angle from which you cannot view their face looks
hot but
actually turns out to be ugly, a bit of a munter, after viewing their face.
Dave: Phwoar, she looks tasty...from the back.
David: I bet you that when you see her face she'll look
like a right munter...
Dave: Shit, you're right, she looks
like Boris Johnson, what a walking
stick!