>"you're in luck" means the same as "out of luck".

you guys are playing with my mind now; I'd say "you're in luck" means the opposite of "you're out of luck"; but once you've realized that good luck it can be said that "you lucked out"--"you lucked in" I've never heard.

apologies for any inadvertent mantling--I'm suffering from an awful head cold and have been feeling discombobulated all day.