An easy way to blame ones own short comings on a shift in timezones but not necessarily restricted to having to actually crosssaid timezones see: NHL 98.
man1: dude I just kicked your sorry jet lagged arse in tony Hawk 2
man2: I have jet lag man1: lick my nuts
A good excuse for blaming nature (and subconsciously yourself) to cover your inadequacy our shortcomings. Unfortuneatly this falls flat as an excuse if you use it in the same time zone. Note this also can interchanged with "this is a different version to my Playstation Ice Hockey" or "my sight is misaligned"
I should have rolled 6 instead of 3 but couldn't because I have jetlag.. also the dice are broken.. ehh I think
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"