Ever met Two-Faced Bitches?

two-faced (tfst)
adj.
1. Having two faces or surfaces.
2. Hypocritical or double-dealing; deceitful.

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two-faced·ly (-fsd-l, -fstl) adv.
two-faced·ness n.

Adj. 1. two-faced - marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another; "she was a deceitful scheming little thing"- Israel Zangwill; "a double-dealing double agent"; "a double-faced infernal traitor and schemer"- W.M.Thackeray
double-dealing, double-tongued, duplicitous, Janus-faced, double-faced, ambidextrous, deceitful
dishonest, dishonorable - deceptive or fraudulent; disposed to cheat or defraud or deceive

2. two-faced - having two faces--one looking to the future and one to the past; "Janus the two-faced god"
Janus-faced
faced - having a face or facing especially of a specified kind or number; often used in combination; "a neatly faced terrace"

http://www.thefreedictionary.com/two-faced

We all have our fair share of interacting with those kind of individuals. Some we triumph, some we lost. If you have your own experience, it's better that you share others and warn them. But remember to BE OBJECTIVE. We all have a tendency to be bias towards ourselves.