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3.
A ridiculous phrase combining anal sex with a none anal orifice.

Popularity increasing after a competition on www.rllmukforum.com - a computer gaming forum - where a prize would be given to anyone using the phrase audibly on television. Google it, you can see it used on Youtube for it's first ever televisual viewing.

The man using it knew what he was doing and was not simply trying to stoke the fear around Manhunt at the time as some believe.
"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..." - Mr Robert, host of Consolevania
by Rupert Pick September 24, 2012
 
1.
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
 
2.
Phrase originating from the verb 'to bum' (see sex up your arse) which comes from the english noun meaning bottom, and sex to do with such'.

A playful and hilarious threat between friends being silly. Refers to anal sex and oral sex without making any sense at all, anatomically or otherwise.
Shut up, or Miffed will bum you in the gob
by Guru Meditation Error January 07, 2004
 
4.
Ass to mouth ATM. Riotous and somewhat disgusting behaviour among close friends and loved ones.
Evolved from Tea bagging
My poor mate rossclot was 'bummed in the gob' by my other mate stu, whilst the chap slept.
This involes the former removing his trousers and placing his anus upon the latters nose. Highly amusing and dangerous if the said victim arouses from a state of unconsiousness.
by Adzrhys1 August 27, 2007
 
5.
When a penis penetrates the anus, travels through the colon, intestines and out the mouth.
Slut: His 30 foot long penis left me bummed in the gob when he pushed it all the way in!