Green’s Dictionary of Slang

stramm, the n.

[? SE strumpet, or US stram, to walk some distance or dial. stram, to bang, to strike and the widespread equation of sexual intercourse with ‘banging’]

the profession of street-walking.

[UK]W.E. Henley ‘Villon’s Good-Night’ in Farmer Musa Pedestris (1896) 174: You judes that clobber for the stramm, / You ponces good at talking tall.