Flip-Flop, Flippy, Flip-Floppin'

An adjective that can be used to describe someone who pretends to love you one day but talks bad about you behind your back the next (or vice versa). Chances are, this type of person will make you heated.

I can't believe she complimented me like that to my face after what she said about me in the press yesterday. What a flip-flop, flippy, flip-floppin' lady!