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A fancy way of saying you're a backstabbing, lying, smug, power-hungry snake who thinks everyone is a fool. High Machs are like the kings of the office, always smiling, but they'll stab you in the back if you look at them wrong.
At work, I said, 'You're a high Mach, you're gonna backstab me if I breathe wrong.'
My friend texted me, 'I brought a high Mach to the party, and he's already plotting to take over the world.'
My teacher said, 'You're a high Mach, you're gonna fail this class and then blame me.'