"stfu" basically stands for "shut the fuck up. sometimes its sarcastic, and sometimes the person wants to kill you.

so when you got a text back from your friend saying stfu, they might not be your friend anymore, or they are joking.
But it basically means shut up...

Sarcastic:
Josh: where do penguins come from?

Jane: stfu

Serious
Grandma: Heres your food!

Kid: i wanted chips damnit!

Grandma: stfu

by Switslayer August 20, 2017

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Stfu

"Stfu" is when someones want to have sex with you secretly and would like you to not tell anyone else. They also love you so much and will give their life for you

stfu baby

by Mariam dictionary June 25, 2021

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