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Hell if I know means you’re clueless and pretending to be smart. You say it when you’re trying to act like you know what’s going on but you really don’t.
"H2IK," he said, staring at the broken toaster like it was his enemy.
She said, "H2IK," and walked out before anyone could ask what she meant.
He said, "H2IK," and then immediately asked someone else for help.