Shibby is (or was back in the early '90'
s) a greeting: "What'
s Happening?", or "What's up?", though it can be also used to say "Seeya!"
Most have it wrong (though I
guess the NEW meaning is now more popular, effectively replacing the old one).
All these 'dude where'
s my car' references are 1) funny and 2) incorrect.