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c.1200, "dull, obtuse," perhaps from or related to Old Norse blundra (see blunder (v.)). Of tools or weapons, late 14c. Meaning "abrupt of speech or manner" is from 1580s.
late 14c., from blunt (adj.). Related: Blunted; blunting.
street slang for "marijuana and tobacco cigar" (easier to pass around, easier to disguise, and the stimulant in the tobacco enhances the high from the pot) surfaced c.1993, but is said to have originated among Jamaicans in New York City in the early 1980s; from Phillies Blunt brand cigars; see blunt (adj.), which has been used of certain cigars since 19c.
Users say that the Phillies Blunt brand produces less harsh-tasting or sweeter smoke. The leaf wrapper of a Phillies Blunt is strong enough to hold together through the manipulations of making a blunt. Other brands fall apart. [http://nepenthes.lycaeum.org/Drugs/THC/Smoke/blunts.html]
A cigar hollowed out and filled with marijuana
[1980s+ Narcotics; fr the Phillies Blunt2 cigars eponymously used]