| Abbreviation | Definition |
|---|---|
| ATM | Another Twenty Missing |
| ATM | Any Time Money |
| ATM | Automated Theft Machine |
| ATM | Automatic Travel Money |
| ATM | Automatically Transmitted Money |
| ATMOS | A Tiger Meeting Operating Systems |
| ATO | After Tan Odor |
| ATP | Al The Pal |
| ATP | All Terrain Pikachu |
| ATP | All Tomorrows Party |
| ATP | Anonymous Tennis Players |
| ATP | Association of Topping Pandas |
| ATT | Another Terrible Telephone |
| ATV | Automatic Trespass Vehicle |
| AU | Alcoholics Unanimous |
| AU | Awfully Underwhelming |
| AUDI | A**holes Usually Drive It |
| AUDI | Accelerates Under Demonic Influence |
| AUDI | Accelerating Unintentionally Designed In |
| AUDI | Actual Use Devours Income |