It means someone or something is mad sexy.
Person 1: Did you see Harry Styles' ass?

Person 2: Yes, he's smexy!
by The Word Girl February 01, 2014

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A very lazy way to say smart and sexy. Smexy is a conjunction of those words. It takes the Sm from smart and the exy from sexy.
Shaniqua got an Honor roll! I knew she was sexy but never knew she was smexy
Damn that girl in calculus is mad smexy
by PrettyBoy November 18, 2012

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Mark Smith
(smexy)ness
by starlight235 December 10, 2011

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a million times sexier tham sexy
hey beour ur pure smexy
by shindig2k11 November 29, 2011

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The way stupid fuckers say "sexy". If someone says "smexy", there's a 99.9% chance they have no social life.
Jon8556: lisa ur smexy
Lisas3xybby1: ik i am so smexy
Pickle_Feet: What a bunch of oders, get out of here you GODDAMN MONGS.
by Pickle_Feet August 16, 2011

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A shortened way to define someone as smokingly sexy
V believes B and L are both Smexy!
by Law507 February 22, 2011

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to describe someone who is beyond being sexy. The definition of hotness.
Man, Charlie and Andy are looking smexy today!
by SmexyMexyshmexypalexy February 01, 2011

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