The act of shitting all over a wall, toilet seat, dumpster, or other vertical plane.

A favorite act of panhandlers and bass fisherman alike.
Ruben (to a Truckstops of America team member):

"Do you have any showers Available?"

Truckstops of America team member (to Ruben):

"We did but the several guys from the bass tour just slaunched in them. Matter of fact, your friend Clay just slaunched the last one. The showers are all closed for cleaning."
by Fuck lasalle February 15, 2021
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Defined as a fish, preferably A large mouth bass in the weight range 4-7 pounds. Anything over 7 pounds is considered a Slaunch Donkey also abbreviated as SD.
Holly cow dude!! That’s a slaunch!
by TheHandsomestBass April 15, 2019
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To slopily or forcibly insert something into something else.
Or slaunch can be replaced with launch at any time.
I slaunched one in her asshole last night!
I slaunched it in her asshole, prior to giving her the angry pirate.
I will slaunch the frisbee 100 yards.
by mdizzlenizzlepizzle April 22, 2006
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Being wicked pissen drunk.
Buffington turned into Drunkington after he got wicked slaunched.

I got fucking slaunched and pissed my self last night.
by Senecal March 12, 2007
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verb

To move rapidly in any direction, usually upwind, in order to not be offended by one's own stench.
You may have showered at someone else's house, Jill, but it's just a matter of time before you come slaunching back to me.
by Mikey the Sub-Genius December 12, 2017
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adj.- characterizing something that is awesome or in one's favor.
That's fucking slaunch!
by Chris September 25, 2005
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Slaunch is a term often used, (or not), by the design community to describe the characteristic of horizontality or a "low slung" visual attitude. A significant portion of midcentury mobern residential architecture, Japanese inspired design, and/or Dr Suess style landscape elements fall under this description.
A tree thinned of foliage or laid down horizontally by the effects of relentless wind or weather would be described as having "slaunch".

Much of Frank Lloyd Wright's "Prairie Style" architecture could be said to have characteristics of "slaunch".

Almost all of Dr Suess' landscpes are characterized by "slaunch",
by Minorblues January 18, 2010
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