When you let air out of your nose when something isn't funny enough to actually laugh at.
That joke was so lame but I did a nose laugh.
by Alexandra2847 August 31, 2006
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When you are trying to conceal a laugh so you laugh through your nose.
I was Nose Laughing so much at work today my boss almost caught me.
by scooty mcdooty August 20, 2014
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