Noun.: Very young, male bodybuilder. pl. "Muscleboys." Sometimes used in a homoerotic way. Origin unknown.
"Jimmy is only 16 and has really bulked-up from weightlifting. He's become a real muscleboy."
One's boy friend in a monogamous homosexual relationship.
"Mike met James just last week, fell in love with him, and now Mike is James' guy friend."
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