When something is really hot or cool.
The Ferrari 575M Maranello is hot niss.
"Yo i just got a million dollars"
"Hot niss"
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Nissing is the act of both nutting and pissing at the same time.
after their passionate embrace, he started Nissing everywhere.
When gnome like traits are thrust upon you from gardening too much.
I don't know Frank, I guess a little gnome(niss) has rubbed off on me.
A casual slang term used to describe a slightly below averaged penis. Non-sexual.
"My niss has been tangled up all day."
To niss (verb). The act of attempting to flirt with someone, yet completely missing the mark, turning them off indefinitely.
To niss, example: I really wanted to get laid tonight, but instead I just spent my time awkwardly nissing.