sthu stands for ''shut the hell up'' and it's another word to tell someone to be quiet.
sibling 1: *being irritable*
sibling 2: ''sthu you're so annoying ugh!''

hope this helps! :)
by ih8myself April 2, 2021
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Sthu, like stfu is another abr. where lazy people choose, to be lazy. It means "Shut the hell up!". Like stfu...
E.g. #1: "Sthp asswipe!"
by N/A April 16, 2005
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Customer 1; Wearing that hat and glove makes you look unprofessional.

Saints; SHUT THE HELL UP!!!!!!!! AND GET THE HELL OUT OF HERE!!!!!
by Saints August 12, 2004
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The most epic saying, shut the heck up, when you play on a christian server and have to roast the epic 9 year olds and destroying libtards
by RedDemon01 May 24, 2019
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Short for Shut The Hell Up. Used when the term STFU is felt to be inappropriate.
friend one: "Dude, I fucked your mom last night."

friend two: "STFU, asshole."

-

friend one: "I took you mom out to nice spaghetti dinner last night."

friend two: "STHU"
by myfixediro September 1, 2008
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