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1.
Died
(Euphamism for death, past tense)
"First shalt thou take out the Holy Pin, then shalt thou count to three, no more, no less. Three shall be the number thou shalt count, and the number of the counting shall be three. Four shalt thou not count, neither count thou two, excepting that thou then proceed to three. Five is right out. Once the number three, being the third number, be reached, then lobbest thou thy Holy Hand Grenade of Antioch towards thy foe, who, being naughty in my sight, shall snuff it." - Brother Maynard, 'Monty Python and the Holy Grail'

"He snuffed it at the last furlong, now they're sending him to the glue factory."
by 4ndy ZM May 09, 2010
 
2.
Whenever an awkward moment is preceded by a person telling joke, a story, or adding a comment to a conversation, the said person "Snuffed it".

Also, a person telling a joke, story, or making a comment that has the potential to be funny or interesting, but completely messes it up.
"dude, I can't believe you told that joke that George told last night. You totally snuffed it."
by Elementcone October 08, 2008