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When movie-goers show up to the theater 30+ minutes before the feature presentation.

The welchers usually play the movie trivia that repeats every 2 minutes and hang their legs over the seats in front of them, so no one else can sit there.
Billy: Hey Rob, let's go welch tonight... call up Jake and see if he wants to come with us.
Rob: JAKE! Wanna go welching with Billy and I tonight?
Welching by Tizz Mizzle July 13, 2007

welshin lelshin 

A lesbian that was born sicotic and returned to a sane state after seven months of abnormal training by a zoo keepers monkey on how to open a doorknob using the cleavage hanging out of a prelicked pussy.
thats some sick shit! u said Martiniasi is a welshin lelshin! WOAH DUDE! that turns me on completely
welshin lelshin by the parsh February 2, 2003

Weeshing 

To have ones period. To weesh.
I need some chocolate because I'm weeshing.
Weeshing by weesher July 25, 2011
The act of performing fellatio on a female in the back seat of an Uber. The vehicle in question must be an Uber and the driver must be aware of the act.
Did you hear about Jim? He definitely Welched that THOT last night in the back of a Ford Taurus. See welching
Welching by Swoler_Bear April 28, 2016
Continually whining, crying, complaining, or bitching about someone else or someone elses work even though you are the one who is a useless fuck-up and caused the problem in the first place.
Welcher (while snot-bubbling):"Somebody put stuff in the area i am working in, but didn't move it out while I was on my phone, playing my game in the shitter for the last 2 hours".

Innocent bystander: "stop your fucking welching, you're a grown ass man, so shut the fuck up before someone thinks we're friends".
Welching by Maverickandgooseforever November 16, 2017
When a group of people send it over to your house for 15 minutes and just absolutely destroy your house
Dickaournddays were caught welching Tyson house by paul