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1.
Fit of Nervous Laughter
When your so nervous and someone makes you laugh, or you are so nervous you laugh.

I went into a FONL at the thought of going to the dentist's.
by mrgt February 20, 2011
 
2.
Fuck off now loser!
why don't you just FONL before I kick yo ass!
by ms dilligaf April 06, 2011