gone to the big (something) in the sky
(Having) died. Something related to the deceased person's interests is stated between "big" and "in." My grandfather's gone to the big library in the sky, but his love of reading lives on in his children and grandchildren.
gone to the big (or great) — in the sky
having died. informal euphemistic The open slot is filled by the name of a place or milieu typically occupied by the deceased in life.
2004 DVD Verdict Harold's pet goldfish has gone to the great fish bowl in the sky, but our favorite toddler doesn't grasp the meaning of death.