the world > relative properties > quantity > greatness of quantity, amount, or degree > high or intense degree > [noun] > quality or fact of being extreme > something exceedingly great in degree > and therefore causing astonishment (4)
Something exceptional in any respect, esp. a large fish.
figurative. colloquial (originally U.S.). A situation or thing that is explosive or controversial in nature; (also) something which is exciting or…
Something remarkable, amazing, or unbelievable. Frequently ironic.