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The feeling of nausea, cramps, stomach aches and bad breath following a binge on lactose-heavy foodstuffs. Usually only applicable to those with lactose intolerance.
"Oh man...I feel like shit, I shouldn't have had those three frappuchinos at Starbucks earlier..."

" Lactose Hangover ? Just sit it out."
by ellziipaw September 14, 2011
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