Opponent fist attacks your face, no you can not activate a trap card.
Trap Card
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is for nerds who play Yu-Gi-Oh! You know, that card game that was popular back in the early 2000s. So in the game, you can activate a trap card when your opponent attacks, but this joke is saying that in real life, you can't use a trap card when someone punches you in the face. Because it is not a card game, genius. You'd think someone as smart as you could figure it out.