Guy can be used in a gender-neutral sense, though it's not really good grammar. Most romance languages use male for a collective group; people often replicate

Guy can be used in a gender-neutral sense, though it's not really good grammar. Most romance languages use male for a collective group; people often replicate this in English (though not always, as not all our words for groups carry gender). Some people then extend this back to the singular, i.e. "hey (many) guys" -> "hey (one) guy". Edit: Down-votes care to comment why?