Meaning

• A young male.

  "Kate is dating a boy named Jim."

• (diminutive) A male child: a son of any age.

• (diminutive) A male of any age, particularly one rather younger than the speaker.

• A male of low station, (especially as pejorative) a worthless male, a wretch; a mean and dishonest male, a knave.

• (now rare and usually offensive outside some Commonwealth nations) A male servant, slave, assistant, or employee, particularly:

• Any non-white male, regardless of age.

• A male animal, especially, in affectionate address, a male dog.

  "Are you getting a boy cat or a girl cat?"

• A former low rank of various armed services; a holder of this rank.

• Heroin.

• (somewhat childish) A male (tree, gene, etc).

Meaning

• To use the word “boy” to refer to someone.

  "Don't boy me!"

• To act as a boy (in allusion to the former practice of boys acting women's parts on the stage).

Meaning

• Exclamation of surprise, pleasure or longing.

  "Boy, I wish I could go to Canada!"