What the waste of centuries in grey and dead in gabu?

It seems like you are referring to the poem "The Waste Land" by T.S. Eliot, specifically the line that portrays a desolate and lifeless landscape. The phrase "waste of centuries in grey and dead in gabu" may symbolize a sense of decay, loss, and emptiness, reflecting the bleakness and lack of vitality in the modern world depicted in the poem.