noun

• (obsolete) Snot, mucus.
• (obsolete) Smell, scent, odour.

verb

• (transitive, UK, Ireland, slang, obsolete) To drug (a person) with a mixture of snuff and beer.

noun

• (obsolete) Leavings in a glass after drinking; heeltaps.
• (slang) A murder.
  "The cops are chasing their own asses on the St Christopher case, so how about a “Are You St Christopher's Next Slaying?” piece? Profiles of all the snuffs to date and reconstructions of the victims' last minutes."
• (attributive, slang) A film or video clip which involves a real non-acted murder.

verb

• (informal, sexuality)
  "If you like snuff stories, Mr. Witomski's computer will send you information about the Gladiator newsletter. And if you happen to prefer killing sexual partners of the opposite sex — no problem, the computer will alter the pronouns."
• (obsolete) To trim the burnt part of a candle wick.
  "The dimness of the light her candle emitted made her turn to it in alarm; but there was no danger of its sudden extinction, it had yet some hours to burn; and that she might not have any greater difficulty in distinguishing the writing than what its ancient date might occasion, she hastily snuffed it. Alas! it was snuffed and extinguished in one."
• (slang) To snuff out; to extinguish; to put out; to kill.
  "Too much of a coward to snuff myself Guess I'll just have to suffer myself"