To throw up/vomit/be sick.
Often but not specifically after consuming large quantities of alcohol.
Person at a party:
*downs an alcoholic beverage then lurches forward with their hand over their mouth*
Everyone else in the vacinity:
"DON'T BERTIE! DON'T BERTIE!"
Person talking about a party:
"...and he drank half a bottle of straight gin, then bertied in a flowerpot."
Person who feels sick:
"Eurghh i think i'm gonna bertie."
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