From two British idioms: "Bob's your uncle" and "Fanny's your aunt"; both of which mean "easy as pie". This particular version casts confusion or doubt on a subject.
Just before diving into the shark-infested waters, he was heard to say, "Everything will be fine, and Bob's your aunt!"
by timmmmber November 8, 2021
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You find out your uncle bob actually had a sex change
Therefore, Bobs your aunt... with balls.... Maybe
Ger: And there ya go, Bobs your uncle

Marty: No, Bobs your aunt with balls bitch!
by BlackMamber January 21, 2011
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