shfuckup 

basically a combination of shut the fuck up. but in a quick slurring of speech.

best use- out of a cute boys mouth.

girl-haha, you suck at life.
cute boy- shfuckup..
girl- haha aww..that was cute. I was jaykay.
cute boy- =)

shfuckup by Angela and Logan! December 20, 2006

shuckup 

The coolest way to say "shut the fuck up". Forget stfp, this is waaaayyyyy better.

"Shuckup!" I said to the annoying person.

shuckup by taytay11 February 9, 2010

Shuckup 

Shorter and more friendly way to say “shut the fuck up” parents can say this in front of children and not worry about getting a call from the school

That woman gossip too much she doesn’t know what she’s talking about she needs to Shuckup!

Shuckup by Scarlette Daisey August 16, 2022