1. n. [acronym: Binary Large OBject] 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.”