Literally, it is in reference to the Reebok Classic shoe. But essentially, it refers to those kicks you have stomped through everything while wearing, i.e. those sneakers that you need to replace, and needed to for a long time, but yet you hang onto them...and still wear 'em...
(literal)
I'm kickin them Icy White Soulja's
(figurative)
bitch I've ran to death in my soulja's
ran from the cops in soulja's
got a blunt tucked tight in my soulja's
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.