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1.
(n./gerund) A euphemism for the act of vomiting or, for the more colorful imagination, puking one's guts out from over-eating and/or over-consumption of alcohol.
I ate 35 stuffed shrimp and drank 27 White Russians, then I was blowing lunch and enjoying them both a second time.

I drank four cases of beer and I was blowing lunch like there was no tomorrow.
by Rick Roberson March 02, 2009