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Comes from the Edinburgh slang "Stormin Norman", meaning to be on you own.
Sometimes modified to "stormer" - someone who is on his storman
Or even to be "storminated" - literally "on my own"

This is not the harshest work in the urban dictionary but if coupled with a swear word or two, someone might stab you (if you were in Glasgow).
Guy 1: "I've been on my stormin all day, its getting on my tits"
Guy 2: "Thats cos ur a smelly c*nt"

Jock: "Your a f*cking stormer you fat b*stard"

Slim: "I hate being storminated, I have to jack off to keep myself company"
by Jimmay Rae March 09, 2006
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2
When you chug something and puke shortly after
Dude Chancey chugged a beer with us and started stormin because of it
by kalikohulten August 07, 2017
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