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I understand both are vulgar male forms of eat, but why these two kanji are
basically the same? What means that 口 in there？
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2015-12-24T02:49:20.543
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kanji
Difference between 喰う and 食う？
口 means mouth. Since Kanji is ideogram, both have 食 that means eating and
food. Other kanjis related to food/eating also have 食:  

  * 飯 (rice) <http://kanji.jitenon.jp/kanjib/592.html>
  * 飲 (drink) <http://kanji.jitenon.jp/kanji/249.html>
  * 飢 (starvation) <http://kanji.jitenon.jp/kanjid/1649.html>
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2015-12-24T04:38:03.343
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Dictionary says 喰 is made in Japan to emphasize the action of eating by adding
口 next to 食.

The difference of two kanjj is that 食 is a kanji designated for everyday use
and 喰 isn't that, so we mostly use 食. The difference of meaning is little, so
if you use only 食, it is no problem.
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2015-12-24T09:19:52.223
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The earliest appearances of 喰 in dictionaries are, as @変幻出没 said, those in
[龍龕手鏡（龍龕手鑑）](http://archive.wul.waseda.ac.jp/kosho/ho04/ho04_00789/ho04_00789_0003/ho04_00789_0003_p0065.jpg)
or [新撰字鏡](http://mahoroba.lib.nara-wu.ac.jp/y05/html/675/l/p022.html), but
their definitions are not much same as today's. The meaning they suggested is
like "dine", "dinner" or "have a meal" and likely to be a variant of 飧.

In more recent usages 喰 explicitly represents くう and くらう, contrary to 食 can
also be read たべる or はむ. I'm not sure if the kanji was recycled or reinvented,
but it certainly had some usefulness because pre-modern orthography rarely
used okurigana, making it difficult to distinguish certain homographs. In this
sense, you can also say that 喰 has already lost its reason for existence, but
it's still in use, especially when you want more "bite and booze" feeling or
violent "consuming, devouring" implications.
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answer