Green’s Dictionary of Slang

1. dancing.

1846		Swell’s Night Guide 47: A boshman every Tuesday night for hopping and chaunting.
c.1885		‘’Arry at a Political Picnic’ in Farmer Musa Pedestris (1896) 169: The band an the ’opping wos prime though.

2. (US) travelling for free via illegeally boarding freight trains.

2022

Reedus & Bill Ravaged 144: ‘[T]rain hopping equals mobility [...] removes us from the norm, from working long hours for shit pay’.