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1.
A descriptive smiley added to posts on some online forums to show film noir type dramtic attitude, OR that the user is currently smoking something (such as cannabis, tobacco, crack, or jenkem).

Originates from BBcode tag for the smiley. Also seen as :smoke: and :smoke.
<brian12> the dude tried to sell me a pair of magic rings that would turn me immortal
<brian12> i asked his address and called the cops on him for fraud ::smoke

... or ...

04:18 <P0tHe4d-007> rolling up :p
04:20 <P0tHe4d-007> here we go ::smoke
by bustam04n December 04, 2010