Someone who just spews 'jargen' at any given moment to ascend what he thinks is the social ladder but its actually just the degenerate ladder.
Potentially you may be idling and start to think of some random words you can construe in a completely unreasonable way and apply it to a scenario which does not relate or warrant them at all and then you start to change the words and formulate a story with characters that rhyme or half rhyme with your new words and then just go down the verbal-mental rabbit hole.
Person 1: "Major maggot brains healthy kids meals"
*development*
Person 2: "Majoris maggot brans healthy school meals"
*development*
Person 1 *while laughing*: "you're such a jargen-smith"