Literally, to trigger an explosion in some sort of secure space, of sufficient strength to breach the doors and allow entry, usually for some nefarious purpose.

By extension: To exceed some form of convention, norm, or expectation by a wide margin, to the point of obliterating those expectations and redefining the conceptual space.

Popularized by Michael Caine's famous line from "The Italian Job" during a bungled burglary attempt: "You were only supposed to blow the bloody doors off!"
They've got no idea how much money 'Fast & Furious 6' is going to make this Holiday season. It's gonna blow the doors off!
by Fun Bobby 24601 September 4, 2015
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a childs way of saying a fart. similer to a billy but with blow off added for fun :S
child 1: i just done a billy blow off
by lord_almighty May 25, 2008
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The act of using a high powered, high caliber slug to cap or blow ones genitalia off of there body in an act of rebellion against a figure of power or authority who does not wish to comply with requests or demands of the one blowing his junk off.
Mitchell: mom i am going to BLOW MY JUNK OFF if you dont pay 3 more months subscription to WOW!!!

Mom: mitchy NOO!

mitchell: NO WARCRAFT ,NO JUNK!!!
by chuckt12 May 31, 2009
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The action of when a first-time toker cannot hold in his first hit of dank, and soon after coughs so violently/recklessly that they spill the bowl.
Me: "Alright man, the number one rule to chiefing is to not, under any circumstances, spill the bowl"

<lighter>

Him: <small-inhale> *coughing*"holy shit dude, it burns"

Me: "The number one rule, what was it?"

Him: "Sorry bro, I'm not good at this."

Me: "It's common-fucking-sense, don't cough on other people's shit. If I asked you to hold my cupcake while I tied my shoe, and you had to cough, would you cough on my cupcake?"

Him: "No, I'd hold it away from my face and cough."

Me: "Well there you go, how about you do that instead of blowing the sprinkles off the cupcake!"
by Bigmanswole March 23, 2010
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To take part in a perceived fun activity or activities after an intense emotional taxing day or days at work , school, or home. Always associated with doing something different to get your mind away from your problems. Typical non-harmful activities include exercising, sex, playing games, camping, dancing, watching a movie, listening to music.

Some activities can be satisfying but ultimately detrimental to your health such as binging on alcohol, drugs, smoking, or food.

Other activities can be criminal. Spray Painting walls, vandalizing homes or places of businesses, rioting (usually after a favorite team loses), or physically taking their aggressions out on people (spousal abuse, worker abuse or detainee abuse have been cited as blowing off some steam).
Example 1:

Buddy 1: "Damn, your boss is making you work weekends and overtime over something he did wrong? WTF?

Buddy 2: "I know man, well lets go to the bar, grab some brews and blow off some steam"

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Example 2 (CBS News):

Rush Limbaugh trying to explain why detainees were tortured by U.S. personnel in Abu Ghraib, Iraq:

"This is no different than what happens at the Skull and Bones initiation, and we're going to ruin people's lives over it, and we're going to hamper our military effort, and then we are going to really hammer them because they had a good time. You know, these people are being fired at every day. I'm talking about people having a good time, these people, you ever heard of emotional release? You ever heard of need to blow some steam off?"

~~~~~~~~~~~~~~~~~~

Example 3:

Her: "I don't feel like having sex tonight, my hair is a mess and I have a headache....(10 seconds later) ..Where are you going?"

Him: "Gonna blow off some steam (Drives off)"
by The Fuzzy Popsicle July 8, 2009
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Brainstorm the numeric value of quantification as a method of relaxation and ascending to a higher state of emotional stability in the workplace.
In Jack in the Box, we used to blow off some numbers at least once per week. Here we are, all VPs now.
by ef_ July 27, 2016
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A rudimentary verbal expression of bliss, defined by a meathead (indigenous to the northeast region of the united states) who had the unbelievable fortune, of getting some action from a soon very regrettable chick.
One of Joey's many side chicks, went down on him in the front seat of the Eldo. Blowing his doors off while still in Park.
Also see meatwinner
by Guido4life December 29, 2016
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