A condition commonly suffered after excessive partying, named after London's most hedonistic district. The effect is reminiscent of the effects of long distance air travel, whereby your body no longer has any concept of what time of day or night it really is.
Cassie was struggling on on Sunday. After Friday's drinks got a bit out of hand, she had a serious case of Whitechapel jetlag and still isn't completely sure what day it is.
Problem on the last night of the school holidays, which is to be followed by the first day of school. You are forced to adjust yourself back into your old sleeping pattern, in the knowledge that you will be up before 7am, but cannot get to sleep.
*5 students collapse*
"wow.. that's some prettybad school jetlag.. they must've been going to bed at 5am all summer.."
When you travel to a different country and the difference between them (in hours) is too big, you might suffer of jetlag. Sometimes it has.. a headache, dizzy feeling or any other health problem.
jon: were you sleeping?
andrew: ooohh.. mate im toooo tired.. my jetlag is killing me.
A jetbagger is simply a person who puts bags onto a plane as his job. Also known as an idiotic person who keeps pissing you off. Also can be any person who is being evil.