I'm wettin shit up, you get hit up, by the super soaker
Brain after brain, I'm a motherfuckin chain smoker

from Kool G. Rap – Executioner Style Lyrics on Rap Genius

Meaning

Wetting is another word for killing/destroying, and he “wets” people with he’s gun..Something that also wets people is a super soaker, so he’s gun must be a super soaker!

with he’s super soaker, he also kills a lot of people, hence the term “brain after brain”. “Smoking” is also another word for killing, and as previously stated, he kill’s a lot of people and therefor, becoming a “chain smoker” which is also a term for breathing in second hand smoke! very clever lyrics.

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