Newborn massacre, hopping out the passenger
With calendars, cause your date's comin'

from Kendrick Lamar (Ft. RZA) – Ronald Reagan Era Lyrics on Rap Genius

Meaning

The gangsters that K.Dot rolls with, take a more philosophical approach to their killings. Though these exchanges may be a bit awkward:
“BRRRRRATT, my nigga, tomorrow morning."
"Oh, okay then…"
"Yeah, sorry dude.”

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