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When a girl orgasms so forcefully that the hydraulic pressure of her ejaculations renders you unable to maintain penetration. The girl herself is a gusher.
I would have stayed over, but when she got off we had a blow-out which knocked me to the floor. So I just put on my pants and left.
blow-out by Jickety April 8, 2008
When you either fart, shart or shit and you blow your intestines out whilst doing so.
Person 1: ‘What do you think is the worst way to die?’
Person 2: ‘A Blow-out.
Blow-out by Nintendo Portable Device December 28, 2018
To scream at a group of people from a moving car. Followed by a quick getaway only if any member of the forementioned crowd has access to a car. This maneuver is preferrably executed at night to minimize the chances of your identity being known. Many times directed toward homeless tramps/skanks/posers, adolescents, and the elderly. The object simply being to scare the shit out of any unsuspecting person who must taste the brunt of your wrath. Does not have to be a coherent word - it can be any form of loud noise as well, such as an airhorn.
"We took a lap last night and did a blow-out to some people on graham (ave)."
blow-out by degowhop May 14, 2007

Blow out of water 

totally dominate the opponent in the competition, especially in a close race. Comes from WWII when warships were destroyed and blown out of water by submarines
(Blow out of water) Dr. J tries to blow his former advisor out of water in developing drug X, a project he worked as his graduate student.
Blow out of water by jessec December 29, 2005

Blow out the fans 

1. Take a poop.

2. Take a really stinky poop, one that may perhaps break the bathroom fan.

3. Leave a really stinky fart. One that clears out a room.

3. Funny way to describe the act of taking a poop or farting to your significant other without actually saying 'take a poop' or 'fart.'
(Someone enters a recently used bathroom)- WOAH! Someone blew out the fans in here!

My stomach hurts. I think I need to go blow out the fans.

The dog just blew out the fan.

Me: I just blew out the fan in the bathroom.
You: Did you spray?
Blow out the fans by shyttr November 24, 2010

Blow out the starfish 

When, after having sixteen Tequila Fannybangers and six pounds of pulled pork with Tapatio hot sauce, you will commence shitting your life out. As fecal matter evacuates your rectum with the fury of all of the Earth's volcanoes combined and your ankles begin sweating profusely, you are "blowing out the starfish".
"Hey Jeff, are you going to go for the Habenero chili?"

"Nah man, I don't want to blow out the starfish today."