The stupid way of spelling stupid. Basically, it's how illiterate morons try to be clever by using big words with 2 syllables. Except they spell them wrong.
Moron: OMG u r lyke sooo stupied !!!!!!!!111
Person: I'm not so sure about that, but I know you're stupid.
verb: to have studied something but have gotten stupider because of it
adjective: describes a person who seems to only become dumberer
A: "OMG, I studied for two months straight and got a lower score on the test!!"
B: "Wow, you must have stupied really hard for that one. You are so stupied."