The Collaborative International Dictionary of English v.0.48:
Hail-fellow \Hail"-fel`low\ (-f[e^]l`l[-o]), n. An intimate companion. [1913 Webster] Hail-fellow well met. --Lyly. [1913 Webster]WordNet (r) 3.0 (2006):
hail-fellow adj 1: heartily friendly and congenial [syn: comradely, hail- fellow, hail-fellow-well-met]