A singlular, detached thumb.
Frank: "Hey, Bob, what are you looking at?"

Bob: "Somebody left a thumbus in the gutter."

Frank: "O, I guess a couple of hobos must have had a knife fight."
by leontrotsky32 November 22, 2009
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A meme of a very odd fellow standing outside the white house (or the “city hall” as told in lore.)

Seeing a Thumbus is said to bring good luck and several copies of the 2008 animated film “Robots” on DVD.

The Thumbus meme is beloved by millions but is hated by Gregbus fans who claim the Thumbus meme ripped off their cool original meme. Never meantion Thumbus memes to a Greg Head; its kind of like football teams in the UK.

The meme is also associated with the song “Peanutman” by Tim Buckley.
“Funny Thumbus meme todd; post that to twitter and get upvoted bro! Just don’t post any Gregbus.”
by The Angry Pissedoff Gamer April 10, 2022
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When you have one thumb in a girls butt, and with the other hand you are eating chicken mcnuggets dipping them hot mustard.
Tom thumbus mcduffersoned her!
by Tomsaloser July 5, 2021
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When ones genitalia is in similar promotions to ones thumb.

A person with a thumb-sized pee-pee
“John was concerned that when he transferred to his new school people would call him a straight up thumbus.”
by Dingobaby64 February 11, 2020
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A large obscenely person with no transition from their shoulders to their square head.
by Cheeky sod November 28, 2018
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