| Abbreviation | Definition |
|---|---|
| AC | Always Crap |
| AC | Anonymous Coward |
| ACC | Anyone Can Come |
| ACE | A Cool Experience |
| ACEST | Always Check Everything Seven Times |
| ACSH | A** Crack Stage Hacks |
| ACT | Actualization |
| ACT | Anxiety Chat Topics |
| ACU | All Completely Useless |
| AD | Awesome Dude |
| ADAD | Another Day, Another Dollar |
| ADAIR | As Soon As It's Ready |
| ADB | Another Dumb Bunnie |
| ADBB | All Done, Bye Bye |
| ADD | Advanced Dumbass Disorder |
| ADF | Absolutely Daft Fool |
| ADFTD | All Done For The Day |
| ADIDAU | All Day I Dream About You |
| ADMW | Any Day Most Welcome |
| ADN | Anno Dommino Now |