Definition of boying:
(n) :
A male child.
(n) :
A young man.
(n) :
(diminutive, especially with a possessive) A son of any age.
(n) :
(endearing, diminutive) A male human younger than the speaker.
(n) :
(informal, sometimes mildly derogatory) A male human of any age, as opposed to a "girl" (female human of any age).
(n) :
(informal, especially with a possessive) A male friend.