"Its Beggers belief"

what's the meaning of "Its Beggers belief"

This is a mishearing of "It beggars belief," in which "beggars" is a verb. The whole expression means, roughly, "It's incredible" or "I can't believe it."

To beggar a person is to reduce him or her to poverty. By analogy, to beggar something else, such as belief, is to exhaust its resources. A ridiculous assertion like "The moon is made of green cheese" beggars belief: believing it would use up all your capacity for believing. ~rb

Good explanation! Even I can understand it.
SS