Top Definition
A bowel movement (typically at least partially formed) that causes smoky looking steam or vapor to rise from the bowl. The visual is similar to a creature in a foggy bog or marsh in a sci-fi or horror movie.
I am never going to another one of your barbeques. All that Natty Ice, and chili, and hot wings had me birthing a bog monster the next day.
av Fazed-NB 18 oktober 2006

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-A bog monster is a hidious creature from the bog, that reaks like shit, and has a bog eye.
-You can also call taking a dump, having a bog monster, because it smells like a bog monster.
-I just released a bog monster in the bathroom, you might want to wait a few minutes before going in there.
-That bog eyed monster smells like the dump john just took.
av Al Gettin' Stacks 6 juli 2011

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A member of the one of the British Ministry of Defence's covert special ops units, apparently originally named after their service in the 'Bogside' area of Derry, Northern Ireland during the troubles there. Known to have seen service in the middle east, Iraq and Afghanistan.

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.
"There's monsters(bogmonsters) loose on the Bog(side) tonight"
av Droopy_Bollocks 2 april 2014

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A term used to humiliate a person who has a sick fetish for poo, can also be used to humiliate a person who either gives or receives anal sex.

Can also be used in first person tem to describe one's self.
"yo, sam over ther is the biggest bog monster, he did shelly and nadia in the ass last night"

"man, im the biggest bog monster ever. I just enjoy anal to much"
"yer you are a hugh bog monster"

av Matthew & Jessica 20 november 2007

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