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1.
incognito slang for marijuana, sometimes referred to simply as "happy" in circumstances requiring discretion.
Did you score any happy?
I love happy smoke!
by MustangGT July 04, 2005
 
2.
Simply a Spliff. Bringing happiness to the world.
A cigarette with marijuana inside of it.
"Got any smokes?"
"Got some happy smokes!"
by spamidoodle November 15, 2007