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smart-on 

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.
smart-on by TronsauseFiveMillion December 7, 2010

Smart-on 

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
Smart-on by ImSoCoolLolJk January 1, 2013

smart on 

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.
smart on by joelmw October 23, 2010

smart on 

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!!!"
smart on by whoopie Goldberg January 30, 2008

them smart n***** on netflix 

Yo, them smart n***** on netflix is a good ass show
smart one is just a sarcastic way of saying someone is a dumn nut.
"most of my friends are smart ones"...or "man u r such a smart one"
smart one by glonkabletotla June 9, 2009