I've managed to avoid Making Out in Japanese, so I can't comment on whether or not (or to what extent) the material on this guy's page is plagiarized from there.
I can say, though, that it only took about a minute of scanning it over to find a bunch of really fundamental mistakes.
How's it going? --"Dou genki?"
Huh? Is this supposed to be "(Saikin) dou? Genki?" or something like that? As one phrase, "Dou genki?" sounds like nonsense.
What have you been doing? --"Nani yattena no?"
Obviously supposed to be "Nani yatteta no?"
Okay, I guess --"Anmari"
Eh? Maybe in a _very_ specific context?
Listen --"Kitte"
"kiite"
Those are just a few of the more egregious errors. Also, a lot of the "masculine"/"feminine" speech markers (colors) are way off. For example, it says that "Genki yo" should only be used by males and "Genki da yo" should only be used by females. If anything, it should be the other way around (leaving alone the silliness of saying "should only")
It's also kind of strange how it has the "blunt" versions of some expressions "butsu butsu iu na yo", but not for others -- there's only "kiite", it doesn't give "(hito no hanashi o) kike yo" or anything similar.
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Anyway, books and sites like these just show the futility of trying to master Japanese "slang" (which in this case is really just casual speech) without understanding the basics of the language.
Besides, what's the point? Even if a beginning student could hypothetically master all of these little interjections and filler phrases, s/he still couldn't actually talk about anything meaningful.