To masturbate. Originally appeared on "Seinfeld," where George is visiting his mom in the hospital and his mom says, "I go out for a quart of milk. I come home and find my son treating his body like an amusement park!"
"You can really treat your body like an amusement park sometimes, I can hear the sounds when I'm outside!
The feeling you get the day after going to an amusement park, particularly when you spend all day on intense rides. Symptoms include hoarse voice, headache, fatigue, and general pains.
Sam just got back from Cedar Point. He feels bad now, but when he wakes up he'll still have an amusement park hangover.