From Longman Dictionary of Contemporary Englishfellafel‧la /ˈfelə/ noun [countable] spoken informal 1 MANa man There’s a fella outside who wants to see you.2 especially British EnglishGIRLFRIEND/BOYFRIEND a boyfriend What do you think of Janet’s new fella?
Examples from the Corpus
fella• Help us out here, fellas.• They were just going to be over there on the other side of the lake, some of the fellas.• He's a very very pleasant young fella.Origin fella (1800-1900) → FELLOW1 