1. Someone who loves to sneeze in people's direction.
2. Someone who picks their nose and leaves them on noticeable locations.
3. Someone who can't keep their mouth shut and enjoys starting up controversy.
4. People who are snotbombers are unlikely to have many friends, and are commonly characterized as having detailed social issues.
Dude, don't talk to Provost, that snotbomber got all her spit on my notes.
Lauren's such a snotbomber, she won't stop talking about the things I keep secret.