Nya

a standard "Nya" could be compared to saying "Wow, great" or "Amazing" Ex:

Billy: I'm getting married, Will.

Will: Nya!

Sarcastic Nya
Basically saying "Wow, that's incredible" but being really bored and uninterested on the inside. Ex:

Billy: Here's my Magic card collection, Will. Wanna check them out? I'll read their stats to you!

Will: nya.

Sexy Nya
Commonly seen as "NYaAaAaAaAa"

Shouted during the climax of sexual intercourse, generally by the recipient.

There isn't gonna be an example for this one.