noun
plural boys
[count] a male child
son
[count] a young man
a usually young man from a specified kind of place
a the boys informal :the male friends or work partners of a man viewed as a group
[singular] chiefly Brit old-fashioned :a man of any age
The phrases my dear boy and old boy are used as friendly ways for one man to address another man.
[count] :a man or boy who does a particular job
Boy is often offensive in this sense when the person being described is an adult. - see also altar boy, ball boy, batboy, bellboy, busboy, delivery boy, paperboy - see also bad boy, big boys, good old boy, poster boy, pretty boy
boys will be boys
The expression boys will be boys is used to say that it is not surprising or unusual when men or boys behave in energetic, rough, or improper ways.
separate the men from the boys
interjection
used as a way to express surprise or enthusiasm