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a term used to insult a friend when they are behaving in a disgusting manner, possibly ladish or yobbish. However it's used in a humorous way and only applied to friends.
1. Oi stop ketching about.
2. why you acting like such a ketche?
3. you dirty little ketche!!
ketche by Relatively clever July 8, 2010

Ketchup packet 

A ketchup packet is girl code for if a girl (or biological female) is on their period.
Girl: *gasps and looks scared*
Guy friend: what's wrong?
Girl : shakes her head no*
Female friend: *gasps* ketchup packet..?
Girl: nods
Ketchup packet by TransB!tch February 16, 2020

The Ketchup Song 

The dull, monotonous sound produced by the wife for about one week every month when she's "got the painters in"...
I'm going down the pub - Barrymore's got his mates round for a pool party, and to make it worse the wife's singing the ketchup song!
The Ketchup Song by coughing_blood December 25, 2003

vagina ketchup 

a mixture of blood and semen, commonly found when a male ejaculates into a female while she is on her period
When Sally got off of Harry, she dripped some vagina ketchup.
vagina ketchup by MasterBaete March 4, 2008

Ass Ketchup 

When you shart, and and the blood from your cancer and/or rectal infection turns the poopy soup into a tomato flavored red paste, like ketchup.

Origin: While playing I was playing Pokemon (cause I'm a beast), my brother tried to say "Ash Ketcham," but failed like a woman. Naturally we made it into a word.
Chaz- *farts nastily with much gusto* "Aww man, I think I just made ass ketchup... Darn cancer/taco bell."

Bob- "Ever since Todd developed that digestive disorder, the only thing he has had on his burgers is ass ketchup."

Richard- "My name is long for dick."
Sort of like, "fuck", or "damn", but you can say it in front of children, and on NBC in the 1960's. And, yes, this is from the Monkees. However, this is not how they used it. I would just like to see it get used as a swear word.
Michael: "Oh, Micky, your tire blew", Micky: "Kretch!"
kretch by SexxxySleepyJean December 13, 2004