you knows it

This phrase was popularised by The GLC from Newport, Wales, but has had currency in US Afro-American vernacular English and possibly elsewhere since no later than the 1960s.

• "What he did to her was wrong. —You knows it, sister!"
• "Mose would ha rallied, ef eed a been in our ward — ha ! ha ! ha ! — you knows it, Mass Richard !"
• "Buster: (impressed) You'se a cool dude, Butch. / Butch: Hey, you knows it, baby."
• "We welcome you, you knows it. Didn't even need to ask, but it fine all right you did."

• you know it