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When one unexpectedly defecates in one's own pants, due to extreme heat.
Damn! I just ristoned.

Hey, wanna go to a restaurant?
Can't, I just ristoned.

What the heck is that??
Sorry, I ristoned.

Boy its hot out, I think I might Riston pretty soon.

Man, seeing the temperature report makes me want to Riston.
by Sweet Loads May 21, 2004
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2
Being the diamond in the rough...being a bad ass mother fucker..period
He is a Riston.
by Boomboomchuck November 21, 2015
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3
A loveable, yet gangly office creature who stopped maturing after university. This has led to a life of intramural sports, socks with sandals, and a propensity for much younger females, and useless trivia. Quick witted, and dangerous when cornered.
He was so friendly until I cornered him, then he became such a Riston. Yikes!
by Big Yellow Man July 30, 2003
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4
loves small furry mammals... loves having his shining face superimposed on animals and/or babies pictures.
My name is Riston and I LOOOOOOVE nothing more than Wesley Crusher's tight gluts! "Wonnnnna' Wertherz little girl?"
by Wesly Crusher July 29, 2003
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5
upto and including the wrist.
He put even his riston.
by me July 30, 2003
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6
a bitter man who watches parkinglots for a living.
"hey stop watching those students park! Jeez you're suuuch a riston!"
by CFO July 30, 2003
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