I’m out for the count
Yeah, girl, you knock me out

from Justin Timberlake – TKO Lyrics on Rap Genius

Meaning

In boxing, if a competitor doesn’t get to his feet before the referee counts to 10, he’s considered knocked out. When the referee is counting and there’s no sign of the laid-out boxer getting back up, he’s down/out for the count

This might also refer to a standing eight count, during which the ref will count for 8 seconds to give exhausted fighters a break.

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