A euphemism for a hangover. It makes the user of the term seem a little more sophisticated than if they simply said: "I have a wicked hangover and puked all over the place". It's also humorous in that it makes the person with the condition seem like a world traveler rather than a sloppy drunk.
"Hey you look out of it"
"Yeah, I really have a bad case of Jet Lag this morning"
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