Nash

Synonym for "Nice". Can be said with multiple pronunciations.

Tony: "Yo, those girls over there said they wanna chill with us later."
Nick: "Oh, nash."

Nerv

Short for nervous, can also mean pissed off/something got under your skin.

Nick: What happened dude?
Tom: We started talking about the time Billy's sister gave me a handjob, and he got kinda nerv.
Nick: Lol.