To leave an area/place. The phrase is used commonly when people intend to leave somewhere that is boring, lame, or if they just have to leave someplace else. You can say shake, or let’s shake it all means the same. “I’m finna shake see y’all laterrr.” “I’m finna shake this mf.”
“Man lets shake yall!”
“Lets shake I gotta get to the gig early.”