—Will you tell him he can kiss my arse? Myles Crawford said throwing out his arm for emphasis. Tell him that straight from the stable. A bit nervy. Look out for squalls. All off for a drink. Arm in arm. Lenehan’s yachting cap on the cadge beyond. Usual blarney. Wonder is that young Dedalus the moving spirit. Has a good pair of boots on him today. Last time I saw him he had his heels on view. Been walking in muck somewhere. Careless chap. What was he doing in Irishtown? —Well, Mr Bloom said, his eyes returning, if I can get the design I suppose it’s worth a short par. He’d give the ad, I think. I’ll tell him…
Irishtown is a suburb of Dublin between Ringsend and Sandymount (source). I can only think that Bloom knows that Stephen has been to “Irishtown” perhaps by the color of mud on his boots?