Portmanteau of "Brown" and "Mist" - to "Brist" is to break wind violently enough to cause a fine vapour of excrement to stain ones pants.
"Oh God! I just brist all over my pants!"
To break wind with such explosive force a fine vapour of excrement stains ones under-crackers.
Oh god, that felt wet. Think I may have done a brist.
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