If your aunt had a penis she'd be your uncle
A phrase used to disregard an unimportant and often times obvious detail. Used when that detail is used to divert attention from the topic at hand.
Little Girl 1: Why'd you eat my pudding?
Little Girl 2: My aunt is a doctor and she says eating too much pudding makes you fat.
Little Girl 1: And if your aunt had a penis she'd be your uncle, what's that got to do with why you ate my fucking pudding?
Little Girl 2: My aunt is a doctor and she says eating too much pudding makes you fat.
Little Girl 1: And if your aunt had a penis she'd be your uncle, what's that got to do with why you ate my fucking pudding?