One old tramp in edinburgh years ago George was his right name and heused to walk about going "Ho! Kink" so he was renamed "kink" after that. When we saw him over the opposite side of the street to us we would all shout "Ho! Kink" and he would reply "Kink Ho!" at the top of his voice.
Another old bloke we saw regularly wasn't really a tramp, but a major p*sshead we nicknamed "Spider" because every closing time at the pub the bloke would be clinging to the walls of the houses whilst making his own way home.
Its a shame that you don't see much of these harmless characters nowadays, its just not safe out on the streets anymore for them
Andy