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A fancy way of saying you're getting kicked out and told to go buy snacks while the speaker deals with their own problems
Dad: 'I'm just running to the store.' (He left me with the dog and a broken microwave.)
Mom: 'I'm just running to the store.' (She came back with 12 bags and a side of judgment.)
Brother: 'I'm just running to the store.' (He never came back and stole my lunch money.)