Nehrnt is a term used to express one's feeling of happiness, sometimes after tricking someone or making them laugh. It can also be used in place of psych. It's full potential is realized when typed in all caps and followed by at least 4 exclamation points. It's origins date back to the early to mid 1980's when a fat girl on a bus would laugh like that.
You:Hey Sheen, I broke your laptop.
You: Hey guys, I can hardly wait to go to Ocracoke!
Them: I know! NEHRNT!