Let's have bygones be bygones, they don't know what they're doing like a cylon

from Childish Gambino – The Girl Lyrics on Rap Genius

Cylon is a race in the science-fiction TV show Battlestar Galactica.In the show, the humans wage war against the Cylons, which were a machine race created by the humans.
Here Gambino refers to the Humans and Cylons coming to an agreement to forget all the destruction and war and each go their separate ways before they’re all wiped out.

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