When you see or hear something funny and blow some extra air out of your nostrils, instead of laughing. One puff of air out of your nose when you think something is funny.
I tried not to laugh in class, when Tom made a joke, so I snuffed.
Whats blue and smells like red paint? Blue paint *snuffs*
Boy: If I could rearrange the alphabet, I'd put "U" and "I" together.
Girl: *snuffs* But you cant rearrange the alphabet.
Otherwise known as "the snuff", Lovingly fuck the shit out of your virgin or ragging girlfriend and wipe your bloody member across her face. Take a couple Polaroids, show them to your friends, and brag that you're a snuff film superstar.