What is You're full of it?

Abbreviated Y.F.O.I.; An expression that means someone is lying through their teeth about something

Sarah: Did you know that I can do a full split without having my hands on the ground?
Jenifer: You're full of it. I saw you trying to do one a few days, but your feet were not that far a part enough to be a full split and your hands were on the ground.

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You're full of it - video