Someone who laughs using a series of nasal blasts instead of their mouth.

A boy/man with a highly unusual laugh. This person may be tormented for his unorthodox methods of laughter. It is believed that a "Laugher Boy" is able to shove 10 bowling pins up his own asshole while calmly reciting any N*Sync tune.

When you laugh so hard you shit and fart in your pants.

When a person laughs and farts (flatulence) at the same time.