Horrific act of gross sexual violence, as featured in "murder trainer" videogame Manhunt, and as a result in playgrounds across the United Kingdom.
"Manhunt is a very violent game - it's a game that features people getting bludgeoned to death, people getting bummed in the gob, people getting garrotted..." - a videogames "expert".
by An Outraged Parent August 10, 2004
Get the bummed in the gobmug. To un-intentionally show you bum. Usually only the top part is revealed when bending down. Or if you’re a builder of some description you will already be wearing loosely fitting pants that assist in revealing your bum crack.
I was walking along the street when I saw two moons looking at me. The fattest builder was showing every one his bum crack. To which I shouted out say no to crack!
by Harpo July 20, 2004
Get the Bum Crackmug. 
by silentotto July 14, 2008
Get the bum watermug. by JoshuaRay September 25, 2007
Get the bum snoggingmug. Something that "hums" (stinks) which also comes from your bum. i.e farting..guffing, trumping...bottom vapours!!!
by BFREASH February 17, 2010
Get the Bum Hummug. by Rory September 14, 2003
Get the bum goblin'mug.