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1.
htting the foil where I come from means to smoke crank off of a piece of aluminum foil. chase the dragon.
Hey man wanna' hit the foil?
by Janice September 27, 2003
 
2.
An obervation from one person to another that they are not thinking with logic.
Damn foo you be hittin' the foil or something?

Excuse me sir I have made a keen obervation that you might have been hitting the foil because of your unwise decisions.
by GhostDog July 06, 2003