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Slang term used mainly in London to mean quiet or silent. Pronounced "shtoom".
Keep shtumm and we won't get caught.
by B-Den June 17, 2006
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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2
adjective: to keep quiet, with regard to not talking about something.
Used throughout British Isles
You better keep shtum about that before the whole world knows!
by EvilOverlord September 20, 2004
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3
Shtum is closely related to the German word "stumm". Both wordsmean not to say anything. There is no correlation between "dumb" and shtum, as dumb (or dumm in German" has it roots in "not knowing".
by Karl from Oz March 02, 2006
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4
Comes from the German word for 'dumb' (incapable of speaking), though it is spelt 'stum' in German. Spelling in English somewhat ambiguous.
"Keep stum or I'll chop your facking balls off sunshine!"
by Billy-Bob McSanchez April 06, 2005
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