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..
117π 31π
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!
16π 63π
When someone makes no sense and they are not dumb they stum. (basically a Neck in a word form)
Friend: *walking in the middle of the street
ME: get on the road .
Other friend: That was stum. Are u serious, get on the road?
4π 13π
To be both dumb, and stupid. Many people who are stum are also mentally defficient.
10π 2π
A combination of stupid and dumb
If you think 2+1 is 4 you might be stum
3π 6π