A big biff is when you fall down, mess up on something, get pwned by someone or generally do anything that causes embarrassment.
Person 1: I tripped over my own shoelaces and fell down in front of everybody at school.
Person 2: Yikes, big biff!
Person 2: Yikes, big biff!
by Zozothecat July 7, 2022
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big biff
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