Square up this joint
Verb, used in the context of cleaning. To tell someone to square up this joint means you're telling them to clean said place. Joint referring to the room/house you're standing in.
Dad: Your mom wants you to square up this joint, yo.
Son: She wants me to clean my room?
Dad: Word.
Son: Okay.
Dad: Represent.
Son: She wants me to clean my room?
Dad: Word.
Son: Okay.
Dad: Represent.