B737-800 flight attendants reported a ground gate return due to a fume event during taxi.

Attributes
ACN	1722382
Time
Date	202001
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Flight Attendant (On Duty)
Qualification	Flight Attendant Current
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Illness Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

After the safety video was finished; #3 (me); #4; & #2 were walking through the cabin doing our safety compliance checks. The minute we all got in the aisle; we smelled a horrific dirty sock smell that reminded us of a dirty boy's locker room. Passengers were stopping us asking what that awful smell is. I #3 ran up front & called the cockpit. We eventually went back to the gate. Everyone deplaned including all 4 of us F/a's & the cockpit. Maintenance was waiting for us & they took the plane out of service. We 4 F/as went to the emergency room here in ZZZ to be tested & checked out for poisoning since it definitely was confirmed it was a fume event!

Original NASA ASRS Text

Title: B737-800 Flight Attendants reported a ground gate return due to a fume event during taxi.

Narrative: After the safety video was finished; #3 (me); #4; & #2 were walking through the cabin doing our safety compliance checks. The minute we all got in the aisle; we smelled a horrific dirty sock smell that reminded us of a dirty boy's locker room. Passengers were stopping us asking what that awful smell is. I #3 ran up front & called the cockpit. We eventually went back to the gate. Everyone deplaned including all 4 of us F/A's & the cockpit. Maintenance was waiting for us & they took the plane out of service. We 4 F/As went to the Emergency Room here in ZZZ to be tested & checked out for poisoning since it definitely was confirmed it was a FUME event!

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.