look up any word, like wcw:
 
4.
When you suddenly think of something awesome. Like a hard-on but with your brain.
Mike- we need some new ideas
James- OH MY GOSH I just had a smart-on! What if we build a waterproof phone!
Mike- THAT'S GENIUS
by ImSoCoolLolJk January 01, 2013
 
1.
An engorged penis (or its metaphorical equivalent, a state of sexual or quasi-sexual arousal) that results from intellectual stimulation.
Baby, the way your tongue trips across the philosophical terminology and so cleverly articulates the existential quandary--you really give me a smart on.
by joelmw October 23, 2010
 
2.
See smart on.
It saddens me to think that the intellectually challenged are incapable of a smart-on. But a good, liberal arts education is the sure cure for their cerebral impotence.
by joelmw October 24, 2010
 
3.
See smart on.
I sat with my woman discussing life's imponderables and ended up with hardcore smarton.
by joelmw October 24, 2010
 
5.
An erection caused by intense intellectual thought. Came to inception due to its rhyming with the word/phrase "hard-on".
Bill got a raging smart-on when he realized all of the work that goes into the creation of a single pencil.
by TronsauseFiveMillion December 06, 2010
 
6.
what a woman on crack says to you in macdonalds after asking if you're in a cult...
"hey, are you guys in a cult?"
"no"
"oh well...smart on!!!"
by whoopie Goldberg January 29, 2008