I don't understand it
Tell me how could you be so low?
Been swinging after the bell and after all of the whistle blows
Tried to go below the belt, through my chest, perfect hit to the dome

from Justin Timberlake – TKO Lyrics on Rap Genius

Meaning

All of these actions are prohibited in boxing.

She’s unfair, verbally assaulting him so he can’t fight back.

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