While enjoying a house or apartment party, the privy attendees (regardless of formal invitation) proceed to cause irreparable damage to the dwelling for no other reason than personal enjoyment.
After Kenro proclaim "trash-a-house", the party goers proceeded to spray alcohol everywhere, steal anything that wasn't nailed down and defile the off-limit rooms with various sexual escapades.
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Another way of stating that someone is "trashy"
That female bartender is totally trash-house!