Raunchy can be used as a noun, verb, and adjective. If it is being used as a noun, you are referring to some one as a raucher: meaning they are dirty in a sexual way or have a dirty mind. If it is being used as a verb, it is being used in the sense as "to raunch" meaning to walk or move in a sexually dirty way or to creep up on someone to seduce them. If raunchy is being used as an adjective you are describing someone or something as sexual or dirty. You can also describe an action as raunchy, but also by saying someone is doing something raunchily.

Trashy; unworthy. Slutty or skankish. Likes to talk to older guys.. preferably Persians. At the age of fifteen, she had sex more times than my family combined. Likes do to the nasty in the backs of trucks. Only on special events is there ever a bed involved. Her favorite number is 10.

distasteful, obscene, and or just plain gross

nasty/fuckin gross

To be nasty

Someone or something that is pretty damn disgusting.

Someone who is disgusting, or a place that is just absolutely nasty.