Reputed to have used baseball bats and swords & hammers during close quarter attacks to remove hard core IRA units rather than using firearms and having a reputation even amongst IRA units as ultra-violent with no apparent chain of command.
-You can also call taking a dump, having a bog monster, because it smells like a bog monster.
-That bog eyed monster smells like the dump john just took.
Can also be used in first person tem to describe one's self.
"man, im the biggest bog monster ever. I just enjoy anal to much"
"yer you are a hugh bog monster"