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It's when you lie through your teeth and act like you're the smartest person in the room. You don't know anything but you're too full of yourself to admit it.
My cousin said he could fix my phone, then broke it and left me with a bill.
My teacher asked me a question and I just made up a whole story to sound cool.
My friend said he knew the password to my account, then spent 10 minutes trying to guess it.