What does 10 seconds flat mean?

10 seconds flat in Community Dictionary

a phrase used by bronies if they boast that they can do something quickly. It descends from ep. 1 of My Little Pony: Friendship is secret whenever Rainbow Dash stated that she could "Clear all clouds from the sky in 10 moments level" by Thea WinbushReport definition
a typical term of as yet not known source, by which one promises to complete a job in 10.00 seconds. Existed long before the existance of My Little Pony: Friendship is miracle by Avelina LonginoReport definition
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