It is Khmer slang which basically means Jack-of-all-trade. The origin of the word came from a name of a food that is usually cooked during Chinese New Year which consists of many different things and ingredients mixed in.
A: So what do you do for a living now dude?
B: I do UX/UI design, code websites, do video editing, create content, and manage Facebook pages as an admin. Basically, chab chhay man...