Euphemism.
Cab Tout (exasperated by the persistent attentions of constable). "Look 'ere, ole lightnin'-ketcher, w'ere the missin' word are yer shovin' us to?"
Coster (to acquaintance, who has been away for some months). "Wot are yer bin doin' all this time?"
(Bill Robbins who has been "doing time"). "Oh I 've bin wheelin' a bit, ole man—wheelin' a bit!"