Now, now, now have just one more cap babe
Babe, babe have just one more stem baby

from Kid Cudi – Enter Galactic (Love Connection Part 1) Lyrics on Rap Genius

Meaning

Just one more bit of the drugs.
“Cap” and “stem” are part of mushrooms. He’s telling the girl to eat more mushrooms to continue the psychedelic experience with him.
http://www.erowid.org/plants/mushrooms/mushrooms_effects.shtml

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