I'm trainspottin'

from Tech N9ne (Ft. Snow Tha Product, Twisted Insane & Wrekonize) – So Dope (They Wanna) Lyrics on Rap Genius

Meaning

Trainspotting is slang for shooting up heroin.
It also a English movie from 1996, which fellows a couple of young drugs addicts.

A metaphor for his dope flow — his flow feels like shooting up heroin.
And to use a quote from the movie, describing how good heroin feels:

Take the best orgasm you’ve ever had… multiply it by a thousand, and you’re still nowhere near it.

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