An aerobatic maneuver in which an aircraft flies straight up in a vertical path until it stalls, at which point it spins around and flies back down the same entry path.
Maximum entry speed for the hammerhead should be about 237 mph.
A buttload is often used in an exagerated expression. A buttload is measured to be exactly 47 things.
For example, "There were a buttload of people at the mall today!".
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