Green’s Dictionary of Slang

(US black) certainly! definitely! absolutely!

1996		E-40 ‘Circumstances’ 🎵 Fo’ sheezy, pimpin ain’t easy.
1997–2000		College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Foe shizzy (interjection) For sure.
2000		Ebonics Primer at www.dolemite.com 🌐 fo sheezy Definition: ‘for sure,’ ‘certainly’ Example: You betta have my money, fo sheezy!
2000		Ebonics Primer at www.dolemite.com 🌐 fo’sho Definition: to agree with or understand Example: Example ‘Hey nigga, I know you got that bomb ass ganja.’ ‘Fo’sho.’.
2002		Mad mag. Aug. 11: It’s always classic comedy to watch dumb old white guys discuss [...] shizzling one’s nizzle.
2002		(con. 1998–2000) J. Lerner You Got Nothing Coming 19: ‘Man’s a righteous con!’ ‘Fo sho!’ adds the Bone, proud to have instigated this rich level of sharing. [Ibid.] 149: The Hunger be layin’ in the cut fo you — fo sho! Talkin’ ’bout peelin’ yo onion.
2002		S.F. Bay Guardian 29 May n.p.: BG: Not only that, you got artists on the East Coast saying ‘fa sheezy.’ What’s up with that? E-40: Well, you know, they’ve been taking our slang.
2003		Eble Campus Sl. Nov. 3: fo shizzle – for certain [...] Also fo shizzle my nizzle.
2005		A. Swartz ‘Sweet, Tight and Hella Stupid’ in S.F. University High School Update Mar.–Apr. 2: shizzle – for sure.
2005		B. Shapiro Porn Generation 69: Here's Snoop Dogg's explanation of his babblings: ‘Fo’ shizzle: This has many different meanings. It means for real, for sure’.
2006		Z-Ro ‘Homie, Lover, Friend’ 🎵 Your homie, cause I’m down with you for sheezy.
2010		J. Larence Secret Five 60: Fo’ shizzle ma nizzle. Rispect! Mega so squingy, bro, fo’ sho! Innit? Ran-dom!