Something so hot and sexy you have to add an m to it. It is anything so awesomely weird that you have the desire to add an m to it. Like how hott is hot with an extra t added to it because it is so hot.
My marching band hair is smexy.

Marching band is the most semxy thing on the face of the planet.

Smexy is not a combo of sexy and mexican! Although it could be a sexy mexican...

My knee-high socks and gym shorts are smexy.

Granny oanties are very smexy.
by Princess Peachz November 17, 2009
Get the smexy mug.
It's like sexy with a extra Smack on the ass!
"that chick is so sexy, i just wanna smack that ass!"

"yeah man, she's SO Smexy!!"
by SmexyChick! March 26, 2010
Get the SMeXy mug.
A very attractive mexican. Usually pretty awesome.
Mexi + Sexy = Smexi
"Dam'n Miguel is so smexi!"
by SexyBeast69 June 10, 2013
Get the Smexi mug.
Smexy was actually originally a typo.
Some kids were in user chat room called "Skate Chat" on yahoo back in 2005 when one went to compliment another and accidently put the letter m after s in sexy. everyone laughed about it, but the week after everyone was using it.

this is pretty much how the conversation went:
"omg you are so smexy..sexy*"
"hahahaha smexy?"
"yea ^^: i accidently put an m in there.."
"i like it! Im smexy!"
"you are so smexy"
"i feel smexy today"
by KeyKeyx1000 March 26, 2007
Get the smexy mug.
A cooler, more aproppriate word for "sexy".
"Ohh, that dress is soo smexi!"
by musicrocks123 September 7, 2012
Get the Smexi mug.
A slang term (most commonly used by tweens and teens) to describe something uber-cute and sexy. Often used in a flirty or "girly" fashion.
Uchihacest is so totally smexy! ^.^
by Uchihacest Fan December 27, 2006
Get the smexy mug.