I can personally guarantee that 1/2 of the top 10% of my class would say shit like this. The best was when our valedictorian, in her graduation speech no less, described the halls of our schools as "stampedy" as in, what, full of stampedes? When asked later about it, she replied "It makes sense if you think about it, but, if not for Merriam-Webster, how would we know what words exist?"
Upon showing her it was not a word in the Merriam-Webster Dictionary, she replied "Oh, you must not have the right version."
Holy. Shit.