Let's get it
Nights like this, I'm a knight like this, sword in my hand, I fight like this

from ScHoolboy Q (Ft. Kendrick Lamar) – Collard Greens Lyrics on Rap Genius

Meaning

Kendrick uses a homophone of the words night and knight, again.
Sometimes he is like a knight because he uses his sword, or penis, to fight, or have sex with a girl.

Alternatively, his sword could be his pen; after all, “the pen is mightier than the sword.” In this sense, his fight is a lyrical battle, as opposed to sex.

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