I get a rush from a toilet flush

from U-God (Ft. Ghostface Killah & Scotty Wotty) – Train Trussle Lyrics on Rap Genius

Meaning

I think Scotty Watty is alluding to intravenous drug use in public bathrooms.

http://northerndoctor.com/2010/07/02/fluorescent-blue-lights/

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