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Uncontrollable joy;
A large Uncontrollable grin while having thoughts of pleasure, different from a hard-on because no erection is involved; typically.
Every time I think of my amazing girlfriend I have a raging smile-on.

She is so hot she gives me a smile-on.

I have such a smile-on right now!

oh my god, you get cuter and cuter. You just gave me another smile-on!
by Daniel A. June 21, 2014
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