Snake in the grass
If you describe someone as a snake in the grass, you mean they are false because they pretend to be your friend while actually harming you. He's a snake in the grass — a guy you really can't trust. Note: This phrase was first used by the Roman poet Virgil in his work `The Eclogues' to refer to a hidden danger.
New MexicosnakeshikingFreddy Brown, from
Clouds in My Coffee Part 2