A young, loud, boisterous, male prone to excessive alcohol consumption, aggression and immature, obnoxious behaviour. Monkey boys are generally of middle to upper class origin and have a preference for either preppy or jock attire and hairstyles.
Female college students with any level of sophistication avoid fraternity parties because most frat parties are filled with monkey boys.
“Yo, I monkey boyed the shit out of this dude I bumped into at the club last night”
“Was he stealing your shit or something?”
“No, but he was talking shit at me and I just completely lost it”
“Understandable.”