To tell someone to calm/settle down or chill out. Similar to "take a chill pill."

Etymology of the phrase originates with TUMS, a brand of antacid pills to relieve heartburn and indigestion (i.e. 'settle the stomach').
by 2nukes August 14, 2022
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A "bum tum" is referring to a stomach ache.

"Bum" as in "bummed out" or " bummy"
"Tum" as in "tummy" or otherwise known as "stomach"
"Hey Josh, I can’t make it to your bar mitzvah 2nite"
"Aw common Elliot why not?"
"I’ve got a bum Tum"
by Funky smells August 13, 2023
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