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To bring down the mood of a party or social situation by being excessively awkward or depressing. Similar to being a Debbie Downer or Negative Nancy.
"This party was awesome until that douche came and welched it up."

"Dude, you're being such a welch."
by douchedecon October 4, 2008
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When someone's banter is not on a par with the rest of the group. This usually lead's to said person being left out from group activities and having their bantersauras status revoked.
Marcus, your banter lately has just been welch.

Thank god that fun sponge has moved to Swansea, his welch was killing me.
by BenjtheLAD October 20, 2010
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A person that forgets what they send on Snapchat right after sending it to someone.
by I WILL EAT UR CATS May 15, 2020
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LosPollosTV tweeted that he had a banger stream planned for that day but he welched everyone because his lard ass fell asleep on the sofa and forgot to stream.
by anonymous June 21, 2021
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When you shit puss/ when you have explosive diarrhea of puss.
“Ohhh babe… I’m gonna welch!”
No please babe don’t welch on me!”
by Slimmest August 19, 2021
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