"asd" doesn't have a standard meaning as a word on its own. It's often used as:

*   **A typo or placeholder:** Many people type "asd" when they're just testing a keyboard, starting to type, or typing gibberish.
*   **An abbreviation or acronym:** In some specific contexts, "ASD" (often capitalized) can stand for something. For example:
    *   **Autism Spectrum Disorder** (most common medical use)
    *   **Atrial Septal Defect** (a heart condition)
    *   **Application Security Design** (in tech)
    *   **Automatic Shut Down**
*   **Keys on a keyboard:** The 'A', 'S', and 'D' keys are next to each other on a standard QWERTY keyboard.

Could you please provide more context? What were you thinking of when you typed "asd"?