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!"
Argument against a course of action
Childish, in Chartres
Not give up an argument
Minor argument
Argument ender
Brief argument
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")
Pitcher Doug with whom Tommy Lasorda had an infamousÂ—and recorded--on-the-mound argument in 1977
Overwhelm by argument
Argument makers: Abbr.
"No argument here"
When repeated, a childish taunt