Top Definition
To hold a marijuana joint in ones mouth between the lips with the hot end in the mouth while blowing smoke out of the hole at the other end into someone else's mouth, so as to get a big 'hit'
'Give us a blowback!'
by Anonymous July 01, 2003

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To blow the smoke from a joint from one persons mouth into anothers.
by Anonymous March 13, 2003

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By it's original definition, blowback is the backwards escape of unexploded gunpowder when firing a handgun. In diplomatic terms, it is an unpredicted, negative response against a nation in regards to a diplomatic action that country has undertaken.
The United States, through its underhanded dealings with its enemies, has caused blowback many times throughout its history, leading to bad diplomatic relations and hundreds of millions of people dead.
by QueenVee January 04, 2004

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A slang word used in espionage circles (most famously the CIA), referring to the "unintended consequences of secret operations abroad".
Blowback examples include:

1. Saddam Hussein's invasion of Kuwait - having been helped to power and supplied with weapons and chemicals by the west (the photograph of everyone's favorite Iraqi shaking hands with Donald Rumsfeld says it all).

2. September 11th 2001 - conducted by an organisation composed of operatives trained up by US intelligence for the war against the Russians

3. The Islamic Revolution in Iran, which arose from the bad feeling and anger towards the corrupt, dictatorial pro-American Shah regime, which had been helped into power following the CIA-assisted overthrow of the democratically-elected cabinet of Prime Minister Mossadeq, in response to the latter's domestic policies, principally nationalisation of Iran's oil.
by Gently, Johnny August 26, 2008

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The act of exhaling cigarette smoke into the mouth of another person. Often leads to a hook up.
"I had a sweet hook with Sarah after we did blowbacks at Harry's"
by meinubh July 23, 2012

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A method of inhaling cannabis smoke that gets ye oot yer bastard box. When you give someone blowbacks you take a hit of the joint and then hold it in your mouth. You press lips together with someone else then blow the smoke into their mouth and they get a mega hit. From the side it looks like you're both sticking your tongues down each others throat.
Donald staggered away and fell into the duck pond after he got blowbacks from Shirley.
by Goth Doll September 15, 2016

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when one get heads from someone with a tracheostomy and the act of cuming causes your load to blow back on your balls
My girlfriend gave me good head last night to bad her tracheostomy caused major Blowback.
by zman1000 January 08, 2012

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