Lutha

It mean it's OVER. It is a reference to the late Luther Vandross...

It means it is dead and gone.. it's time has passed... it is over, period.

Often times used when the speaker is really over the subject and wants to rub in the fact that it is so over and done that it will never be again.

It's lutha!
Meaning: "It's over." "It's dead." "It is no more."