Green’s Dictionary of Slang

1. an undetermined but substantial number.

1946

Mezzrow & Wolfe Really the Blues 178: Jack ‘Legs’ Diamond fell into the place with scumpteen of his henchmen.

2. an extreme example of something.

1959

Murtagh & Harris Who Live In Shadow (1960) 54: They said I wasn’t just a viper but also scumpteen of a pusher.