VERB:
To act weird in public just for grins. To play a practical joke. To try to freak people out by calculatedly bizarre behavior. To mess with peoples' minds.
NOUN: The act itself.
"We like to noss whenever we're in a crowd."
"Don't mind me, I'm just nossing."
"Do you think his act was serious, or was it just a big noss?"
"I noss, therefore I'm weird."
Term coined in Indianapolis, Indiana in early 1970's.
Look girls, don't fall for the "such a nice guy" act, we all know he is a nossiter and will try and take you up the wrong 'un at the slightest opportunity