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1.
the usage, esp. by smoking of marijuana made popular from Estacada, and now used by stoners everywhere. Used primarily by kids in school as a codeword to smoke the reefer so that administration wouldn't catch on.
CHRIS!! im about to go twalling before lunch, wanna come?
by Nigel Lensch March 13, 2011
 
2.
The inner walls of a mans anus. T-wall.
Man, I really had a great time playing with my twall today.
by jforbesderulo May 03, 2011