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1.
When somebody has smoked a rather large amount of Cannabis and is quite stoned.

Other Words: Stoned, High, Trippin', Blazed
Guy 1 : "Why do you keep laughing? Nothin funny is happening"
Guy2 : "I'm pretty whiffed right now"
by Stu3y August 20, 2010
 
2.
when an air bubble travels up the shaft of your penis
Awe dude i totally just whiffed myself.
by klepto614 December 14, 2010