Top Definition
A common procedure where one partner lies down on their back on the floor while the other puts their butthole directly above their mouth. The partner then proceeds to diahrrea into the mouth of the other partner. The receiver than has the option of swallowing it or throwing it back up into the other partner's butthole where it came from.
My mouth smelled amazing after Holden's Hot Niss last night!
by Alex Bernard Zafran March 11, 2007
When something is really hot or cool.
The Ferrari 575M Maranello is hot niss.

"Yo i just got a million dollars"
"Hot niss"
by Guinzo March 31, 2003
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