Phrase used to describe something thoroughly masculine and slightly immature.
To describe an attractive, cheeky and perhaps naughty male. Usually wears hoodies and/or caps. Often does graffiti and/or mixes. Can't really be called a man yet even if he is nearly 20. (Used by my friend to describe my boyfriend.)
"Ugh, I couldn't hack last night, it was so boy."
"I don't know why I fancy him: he's just so...BOY!"