A319
Flight Attendant Current; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Returned To Gate
Aircraft
While taxing out; I received a call from the No1 Flight Attendant. She asked me to come to the forward section of the aircraft. While walking up the aisle; I noticed an odor that smelled like dirty socks mid cabin. I asked No1 and No2 to go back and reconfirm my interpretation of the odor. They returned and confirmed the smell. I entered the cockpit and advised the Captain. We returned to gate and deplaned passengers (2). Later I was informed the reason the flight was deferred from the previous night was because of a suspected fume event. We deadheaded home to ZZZ1 on next flight.
Flight Attendant reported an odor that smelled like dirty socks mid cabin.  Plane returned to gate and passengers were deplaned.