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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."
Slaunch by Fuck lasalle February 15, 2021
Related Words

slauncha 

Pronunciation of the Gaelic word Sláinte, meaning cheers or "to your health". Popularized by Irish pubs and beers such as Guinness.
"Slauncha!" (when raising a pint and celebrating with your friends)
slauncha by Alan Dobkin April 10, 2007
to be passed out in a seemingly uncomfortable position due to overindulgence in the use of alcohol or drugs
After consuming an entire handle of Jack Daniels and removing her shirt, Caroline passed out in the chair causing her friends to remark, "slouched."
slouched by MSisdope5 August 20, 2010

splanched out 

"Splanched" is a portmanteau word combining "spent" and "blanched". To say that someone is "splanched out" is to say he looks like he's been through the ringer; that he's pale, drawn, slightly unwell; like he's just undergone a draining personal ordeal; like he's just seen a ghost.
"Wow, have you seen Calvin? He just got back from Japan where he was searching the bins for old vinyl copies of Libby Titus' second album and he looks totally splanched out.
splanched out by chintzy March 7, 2007

Spunched up

Beaten to a pulp. Thrown over a balcony. Completely demolished.
If you don't be quiet, you are getting spunched up so hard your farts are going to rip out of your ass.
I'm going to spunch you up!!!!
To be very high; usually on downers or weed.
-Why are you laughing so much?

~Man, I'm slouched.
Slouched by Schlong Holster September 24, 2013