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.
A casual slang term used to describe a slightly below averaged penis. Non-sexual.
"My niss has been tangled up all day."
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.
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.