I know what a haymaker is, but I don't know who started its use or where it came from. I guess this is a bit of trivia.
The reason I ask this is because I was asked myself and I had no clue.
Umm, partially because his last name is Haye and he throws bombs so that's how he got the nickname HayEmaker
From "Listening to American" by Stuart Berg Flexner (Simon and Schuster, New York, 1982): "haymaker, for a knockout punch, appeared in 1912, perhaps from the 1880 'hit the hay,' go to sleep."
"haymaker" (a powerful boxing punch which mimics the motion of cutting hay with a scythe).