To not talk. To "stay stum".
As far as I can tell it derives from 19th century England/Australia, as read in Bryce Courtenay's 'The Potato Factory'
Hey thanks for staying stum about my involvement in that bank heist..
by Claire Robinson May 26, 2008
poo flick
i will stum you if you dont be careful!
by Snaffalafigus January 08, 2012
When you fuck your girlfriend, cum in her mouth and take a shit it at the same time. You will end up with a room smelling like stinky cum. Thus, stum.
Mate, I fucked Rachel the other day but I really needed a shit, so when I came I couldn't help but shit myself too. Stum everywhere!
by MSlav July 13, 2012
Someone that hangs out in Starbucks all the time like they haven't got a regular home. A 'Starbuck's bum'.
Man, I wish that stum would stop hogging the power socket by the wall over there!
by Ray Price August 26, 2005

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