A fork of Rural Dictionary
Origin: A portmanteau of sweats and jeans.
Sweans are an invention of the fashion industry in the 21st century originally designed as a hip substitute for "Mom Jeans". They offer the comfort of sweats without the "give up on life" attitude. Due to their tight fitting nature, sweans are not regarded as pants in some parts of the world. Not to be confused with swean.
That girl has one hella tight pair of sweans.