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When your body is suffering from a belly that is extremely fat and your tits are smaller than your belly. So when you sit down, your stomach sticks out further than your "tits-do".
Cheri felt bad because she noticed while eating her donut at her desk filled with crumbs that she had a severe case of "tits-do".

TITS-DO by kittyzsister July 16, 2008

tits or gtfo 

An expression often used on imageboards. It is often heard when a girl posts in a thread.
Camwhore: Hi am i hot?
Person: Tits or GTFO.

Tits on a whale 

It can mean anything such as holy shit etc.

Originates from the ultimate-guitar forums.
Tits on a whale by fretsonfire74 August 24, 2008

Tits down 

When you’re russian and mistake “tits up” for “tits down”
Lazar: “going tits down”
Sims: “tits up not down”
Lazar: “up, down, what’s the difference
Tits down by idunnosomedude April 23, 2021

Tits or it didn't happen 

An expression requesting a picture of naked breasts to serve as proof of having a girlfriend. Also used to question an online poster's sexual identity.
Rosencrantz: My girlfriend gave me such a great blowjob last night.
Guildenstern: Girlfriend? Hah! Tits or it didn't happen!

Philomena: I'm a gorgeous brunette with large breasts looking for World of Warcraft fans so I can suck their cocks
Nerdcore: No you're not, you're a guy.
Philomena: No, I'm a girl
Nerdcore: Tits or it didn't happen.