
Fella
Informal Use
 Used in casual situations, not in formal writing or speeches. 
I met this fella at the cafe.
 Friendly Tone
 Implies friendliness or affection, less distant than 'man' or 'gentleman'. 
Don't worry, that fella can help you out.
 Gender Specific
 Refers only to males, can be a boy or an adult man. 
See that young fella playing football?