Basically, the definition for douchebag with House music in the background. It refers to an incident in Boston where a Techno promoter recommended a versatile DJ booking to a House promoter looking for DJs to play his night. The House promoter assumed the DJ would only play Techno, and emailed the other promoter with three simple words: House night bro.
These three words are the essence of douchebaggery with the flair of House music snobs. People and events reflecting this sentiment can be described as "housey," "housenight," or plain "house."

When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.