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Using the bathroom.

Alternate phrase for "smoking a joint." Used when the "authorities" are around, as a discreet way to let fellow stoners know what you just did/are going to do, because it sounds like #1 to virgin ears.
I went downstairs after hitting the john.

MOM: What were you two doing?

KID 1: We were hitting the john!

KID 2: Yeah!

KID 3: (laughs)
by Zolotros March 30, 2010
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