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A big truck or monster SUV that doesn't help with work or farming just because the driver has a tiny weenie.
My uncle's truck is a ma truck. It's got chrome rims but can't plow a field.
That Bronco is a ma truck. It's got a big engine but can't lift a single bag of cement.
He bought an 18 wheeler as a ma truck. It can't even move when he tries to park it.