To do something incredibly stupid, repeatedly. Usually involves an action that is more harmful to yourself than others. Esp when involves lying.
I tried to help him out after his girlfriend kicked him out, but he thomas-upped and I had to bail him out of jail.

She was all over him, but he thomas'd it up and went home alone!

I invited him over for a drink, but he thomas'd me and I had to call the cops.
by weALLknow January 25, 2011
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To throw up the gansta sign with a devilish look in a picture, and then to top it off, make that picture sepia

Then you have "Thomas-ed it up"
"Dude, let's Thomas it up in this picture and post it on facebook!"
by Erika Elise March 16, 2008
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exactly how it sounds. mostly directs to thomas foster
shut up thomas
by DigBick1000000 September 19, 2019
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september 20th is shut up thomas day 2! where everyone in the world named thomas has to shut up!
thomas: hey!
me: shut up
thomas: what?
me: it’s september 24th, shut up thomas day 2!
thomas: oh yeah...
me: SHUT UP
by adorable6d September 12, 2020
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shut up thomas day 3 is the third national shut up thomas day in the world! it’s on october 20th!
thomas: hey
me: shut up
thomas: oh my god is there ANOTHER national shut up thomas day?

me: yup! it’s october 20th, today! Shut Up Thomas Day 3!
thomas: why
by adorable6d September 23, 2020
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