Green’s Dictionary of Slang

1. (US campus, also schroom, scroom out) to act wild, to be madly excited.

1987

Eble Campus Sl. Oct. 6: schroom, scroom out, schroomer – feel or act euphoric, wild, or strange.

2. (US) to ambush.

1993

A. Rodriguez Spidertown (1994) 44: Jus’ be chill on Dawson. Be a eyeball on Avenue St. John. Do yuh thing an’ step. I don’t wan’chu gettin’ shroomed.