Top Definition
A person who is overly excited or cheerful, especially about something lame.
All right. I get it - you like American Idol. Quit being such a Happy Smack about it.
by Willie K May 28, 2008
Heroin that is believed to increase happiness.
I'm gonna buy some Happysmack and feel good all day.
by FenixIgnition August 18, 2011
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