A noun. rough and boisterous play which, in light of the Penn State Scandal has become forever tainted thanks to a certain pedophile James Sandusky.
adj. showering with underage boys (like 10-12 year old boys) and touching their legs but in a supposed non-sexual way.
"We were showering and horsing around, and he actually turned all the showers on and was actually sliding across the floor, and we were, as I recall, possibly like snapping a towel — horseplay" -Jerry Sandusky (phone interview with Bob Costas)
You know it's time to hit the showers at Penn State for some horseplay when the big hand touches the little hand.