Green’s Dictionary of Slang

scammish n.

[ety. unknown]

(US drugs) the acquiring and preparation of unadulterated opium.

[US]G. Bronson-Howard God’s Man 270: Don’t pull any of that stuff to try and git it cheaper. Tom said it was the goods first time, and you can’t get away with it. Tom knows too much about the scammish to make any mistakes.