May mean any of these:
1. A person who has above average IQ (ex. highly educated), uses correct grammar all the time and uses critical thinking in many situations. (The exact opposite of jejemon)
2. Someone who dosen't use web language very often and is quite intelligent.
3. Someone who devotes part of their time denouncing jejemons.
YM or FB chat:
jejebuster: Don't use jeje language!
clueless jejemon: wat r u toking about?
jejebuster: oh my gosh! you're one of them!
clueless jejemon: hoo is dem?
jejebuster: I'm out of here!jejebuster is offline