Green’s Dictionary of Slang

a marijuana user.

1963		M. Braly Shake Him Till He Rattles (1964) 23: What’s shaking, Daddy-O? You catch yourself some poor grasshopper?
1979		(con. 1953) Pepper & Pepper Straight Life 142: They’re grasshoppers, busted for pot.
1990		(con. early 1950s) J. Ellroy L.A. Confidential 24: The scourge of grasshoppers and junk fiends everywhere.
2001		(con. 1964–8) J. Ellroy Cold Six Thousand 242: ‘Bob Mitchum?’ ‘Grasshopper.’.
2021		J. Ellroy Widespread Panic 15: he’s on parole, and he’s a grasshopper. You could call Narco.