their hearts were too small to pump blood to their huge bodies. It was like trying to run a Mack truck on a Volkswagen engine, and their hearts gave out.

Abuses committed by overly aggressive states have resulted in federal rules and paperwork motivated by the fear that without rules and record-keeping requirements, states would show up at the Treasury with a Mack truck to take away all the cash they could.

Mary swept through the board meeting like a Mack truck.

I sprung out of bed and was shoved back by a Mack truck of a headache. I powered through and felt my way to the door, focusing on a sliver of grayish light glowing through the curtains.

“I used to be a once bitten, twice shy kind of guy. Now I get hit by a Mack truck of a girl and realize my life is flashing in front of my eyes. Everything's going too fast anyway, seems easier to go jump in and go with the flow.”

Mack truck

Meaning

Noun