BLOB Used by database people to refer to any random large block of bits that needs to be stored in a database, such as a picture or sound file. The essential point about a BLOB is that it's an object that cannot be interpreted within the database itself. 2. v. To mailbomb someone by sending a BLOB to him/her; esp. used as a mild threat. If that program crashes again, I'm going to BLOB the core dump to you. 3. Derogatory term applied to proprietary software, "binary blob", as in "this kernel contains blobs!"