Where, for instance, did green come from in the contagious ailment called green snake under the green grass? The correct and standard form of the idiom is snake in the grass – referring to an enemy always hiding his head yet present where you do not expect one, a treacherous or deceitful person.
1. verb, slang To cheat or deceive (someone). That lying jerk has snaked us for the last time. The lawyer snaked Tom out of nearly half his inheritance. verb, slang To take (something) stealthily or surreptitiously; to steal or pilfer (something).