Superlative qualifier added to a childish argument in hopes of eliminating any potential for a further retort (of course, anyone who's been involved in a childish argument knows that you can just add

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TIMESINFINITY

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Possible rebuttal in a childish argument
Schoolyard argument retort
Childish proposal to a potential playmate
Retort in a playground argument
Childish retort
Childish retort to "Are not!"
Pitcher Doug with whom Tommy Lasorda had an infamousÂ—and recorded--on-the-mound argument in 1977
Overwhelm by argument
Argument makers: Abbr.
Assumption, in an argument
Suffix with argument
Political argument
Bovine argument at the lanes?
Stopping an argument, in a way
Childish comeback
Big argument
What you might get in an argument (with "a")
"No argument here"
When repeated, a childish taunt
Establish the truth by argument
Trial run for a far-fetched argument, say
Heated argument
Not completely settle an argument [New York]
Childish tantrum
Childish denial