People who travel on trains and are utterly oblivious to anyone or anything in their immediate vicinity. They annoy all the time just by being in the same carriage and frankly should be culled.
Who the fuck is making all the noiselicking crisp salts off their fingers? Oh yea, it's another fucking train mong.
The practise of smoking cannabis through a bong while under the influence of ketamine.
This is a rather intense high, somewhat psychedelic, and sometimes even enjoyable.
The name is a bastardisation of the term Bong Mix, re-arranged so because this activity is known to cause severe episodes of monging out completely.