In older games capturing was mandatory, but if a player overlooked a jump the opponent could huff the piece, meaning they removed it from the board as a penalty instead of forcing the capture.
What is huffing in checkers?
Quick answer: Huffing was an obsolete rule under which a player who failed to make a required capture had the offending piece removed by the opponent; it has been abolished, and today the mandatory capture is simply enforced.
Huffing is a piece of checkers history that you may still hear about, but it is no longer used in modern play.
The old rule
Why it disappeared
Huffing was dropped because it rewarded spotting an opponent's oversight rather than good play. Under today's rules the required capture is simply made, so no piece is ever huffed.
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See how forced captures work