A word one uses to try, and call someone else immature, but instead just ends up making themselves look like a pretentious douche bag.
Guy 1: The jokes on Tosh.0 are so sophomoric.
Guy 2: Dude you sound like a pretentious douche right now.
Sophomoric: regarded as self-assured and opinionated but crude and immature. (See Greek sophos 'wise' and moros 'foolish'.)
Akash, the model for laziness and procrastination while being smart and knowledgable; also associated with "pied piper of slackerdom"