'Shit Up' means to eat or consume shit. It is usually used as an insult.
'Yo, your ugly'
'Shit up!'
by JohnCena's Wife February 27, 2022
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Shit up is when you get pound in the anal with your ass up n shit all over
She shit up after I took my dick outta her ass.
by Aallee November 15, 2017
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"shit up" is just "shut up" with a typo, but more epic
TikTok thot: "omg that video was so funny"
Nick: "shit up"
by Horned_Hiro November 17, 2020
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To insert a cork into someone’s glutinous Maximus and then insert a second cork into the mouth.
“Shit up Darwin!” Said Eric
Eric Proceeds to forcefully insert cork into Darwin’s ass and mouth

Tears stream out of Darwin’s mouth, he quietly begs for mercy that shall not be granted
by Lilac Petal November 1, 2021
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Is when someone is enjoying something or someone to much
Josh was on FaceTime with a female while she was dancing, and he was eating that shit up.
by Chocolate chip cookie dough November 7, 2023
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