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The secret art of sneaky sabotage. A person who acts like they're doing nothing but is really plotting to make you look like an idiot.
My buddy claimed he wasn't helping me cheat on the test, but he whispered the answers to me like I was a baby.
She said she wasn't cheating in the spelling bee, but she had a dictionary taped to her leg.
He pretended not to be trying to win the game, but he was literally moving my pieces for me.