When you fart into a cushioned chair or seat, get up for something and then sit down again, only to have your weight cause the cushion to blow the offensive odor back into your face.
Geez, I gotta get a leather chair. I'm tired of irksome fart blow backs everytime I sit down after lunch.
by Beatnik57 October 24, 2007
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
To blow the smoke from a joint from one persons mouth into anothers.
by Anonymous March 13, 2003
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
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
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
It is when someone (more than likely a male), takes it in the butt and whoever is on the giving end deposits some semen. the "blow back" occurs when the receipient farts it back out on to the "giver". Hence the term "Blow Back"
I was with my "life partner" going hot and heavy and decided to leave him a gift, he decided to take my "gift" and Blowback on me.
by Arrogant Carroll May 17, 2013
A method of operation that is used by most automatic firearms. More explicitly, this is the process used to the cycle the breech/bolt assembly (thereby ejecting the spent casing and chambering a fresh round), by either using the recoil force directly caused by the exploding powder charge, or by diverting the expanding gas of the exploding powder charge via a gas tube and piston.
by Anonymous August 10, 2003

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