Definition of "cha"

[Krazy Kat, bringing a full tray:] Look, folkses – hot dogs, hot cha, hot peppa pots, hot timollies – hot kuffy. [sic]

1934 August 4, George Herriman, Krazy Kat, Saturday, comic strip, page 206

You mean you can't fly after you've had a few beers? You can drive, can't cha?

1976, Flying Magazine, page 34

Don't cha wish your girlfriend was a freak like me?

2005, Busta Rhymes, CeeLo Green (lyrics and music), “Don't Cha”, performed by Pussycat Dolls

“You'll be ridin' with us, won't cha, Josh?”

2008, Barbara L. Jent, The Weddin' Day, Barbara Jent, page 157