emoji, n.Definitions

The Emoji is digital hieroglyphs.

The Emoji is punctuation evolved.

The Emoji is modern day hieroglyphics.

The Emoji is the hieroglyphics of the 21st century.

The Emoji is makeup for girl's texts.

The Emoji is the hieroglyphics of the next lost empire.

The Emoji is an icon required in texts nowadays to convey that you're not angry.

The Emoji is meta punctuation. It indicates the mood in which the writer wants the reader to read the sentence. :).