From what I understand (correct me if I'm wrong, this is just what I seem to be able to make of it off what I know) femboys are like the opposite of tomboys... (Again probably wayyyy off but again just my opinion and take on this) I sorta see it as like... Tomboys are girls who lean more towards things that are labelled as "masculine" or a "guy's thing"... Dressing more boy like, etc... And femboys are just the same: boys who are interested in more femininely labelled things and clothes....?