Green’s Dictionary of Slang

(US) an indefinite or large amount of; also as n.

1909		L.W. Payne Jr ‘Word-List From East Alabama’ in DN III:v 375: steen, adj. An indefinite or large amount of.
1936		A.E. Duckett ‘Truckin ’round Brooklyn’ in N.Y. Age 18 July 7/1: Packing bag and baggage and heading in ’steen different directions.