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Slang/casual definitions:
1. As an interjection, to create a pause when thinking about what to say next, or out of habit.
2. Used in place of the word “said” (often used when relaying an approximation or rough idea of what someone has said, rather than an exact relation)
3. Used to imply an approximate, rather than an exactly correct statement (often exaggeration/hyperbole)

1. “So I was, like, really intrigued”
2. “And he was like, “there's no way I'm wearing that””
3. “There were, like, 15 ducks.”