,noun, verb, thud⋅ded, thud⋅ding.| 1. | a dull sound, as of a heavy blow or fall. |
| 2. | a blow causing such a sound. |
| 3. | to strike or fall with a dull sound of heavy impact. |

thud
1. Yet another metasyntactic variable (see foo). It is reported that at CMU from the mid-1970s the canonical series of these was "foo", "bar", "thud", "blat".
2. Rare term for the hash character, "#" (ASCII 35). See ASCII for other synonyms.
[The Jargon File]