Spontaneous combust' when I smoke a bag of dust
Ahhh what a rush, cigar be the Dutch

from Method Man & Redman (Ft. Blue Raspberry) – Cereal Killer Lyrics on Rap Genius

Meaning

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One of Method Man’s nicknames is Johnny Blaze, who is a Marvel Comics hero with the ability to turn into Ghost Rider — a flamming skeleton. To be “blazed” is also slang for being high. So when Method Man a.k.a. Johnny Blaze smokes a PCP-Dutch Master cigar, he gets blazed and spontaneous combusts like he was Ghost Rider…

Ahh What A Rush is a reference to the catchphrase of WCW/WWE Tag Team, The Road Warriors.
https://www.youtube.com/watch?v=sK2KS93_s4I

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