It means sexy, fancy and smelly all at once and is perfectly described by Elijah Mikaelson's face from vampire diaries. It is being both beautiful and business like at the same time and is a very unique adjective.

the thing that you don’t have when you’re phones percentage is over 20

Semi-Fancy....smancy.

something (an event or article of clothing etc.) which has a hint of class but is also casual enough that you can put your feet up.

Smancy is a very unique adjective that means something or someone being both smexy/sexy and fancy at once. A perfect example of smancy is Elijah Mikaelson from ‘The Vampire Diaries’ and ‘The Originals’