Definition of "onna"

"Next thing I know you're onna ground, bloody. I don't know what come over me. You goin' out?" Lenny asked.

1976, Jonathan Betuel, The Dogfighter, page 187

Mal said, “How you doing then?” “Me? I'm onna dole, mate. I'm onna street.”

2007, Martin Amis, Vintage Amis, Vintage, page 30

I bin tole ta put a rag onna stick 'tween huh teef so she not bite huh tung.

2012, C. V. Warmouth, A Louisiana Purchase, page 405