Tangerine Cobra

Tangerine Cobra (noun) is a term used to describe a trifling, back-stabbing red-haired person, one who is snake-like in character and deeds.

and

A tangerine cobra is a synonym for trecherous ginger, especially in the context of intimate relationships.

and

Sexually enticing red-haired, freckled man or woman whose outward physical charms belie their snakey personalities.

Man, that ginger was cold - she slept with my brother behind my back and had the nerve to take advantage of every kindness from me. She's a tangerine cobra.

I couldn't help myself - even though I knew it was a bad idea I still banged that tangerine cobra at the party.

Dude, tangerine cobras make great lays, but they're fucked in the head.