Definition of "so what" [so what]

• A reply to an unimportant or irrelevant statement, indicating indifference on the part of the speaker. (interjection)

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• "Hotchkiss and Lacy were to find out from Mr. Wellford whether such a route existed, if so what its length was, whether it was practicable for artillery, and if a guide could be procured.14"
• "Ye are locked in, me dimber cullies, so what youse do inside I do not care hany more than Mr. Campbell do."
• "Back in the crumbling remains of what had once been a large farmhouse, the plumbing seemed to be working again, so what was left of Sweetie Pie must have moved on into the septic tank."