horseplay 悪ふざけ

horseplay には馬鹿騒ぎ、悪ふざけの意味がある。0:32 he had me over his shoulders. we were just horseplaying. and I slipped somehow and landed on my back. 父に肩車されて、騒いでいて、何かの拍子にすっころんで、背中から落ちてしまった。

Paralyzed Teen Who Shocked Nurse by Walking is Getting Ready to Dance at Prom

https://www.youtube.com/watch?v=pN4HvrMXbmA  3:27 it may look like a whole lot of horseplay. だたの悪ふざけに見えるでしょうけど、男性は女性を喜ばすために訓練が必要です。
Wild Sex - Virgins | Wild Sex Ep09

https://www.youtube.com/watch?v=2AYSW87YPeI  0:42 we were told this was some kind of horseplay that got out of hand. 警察官がパトカーから吹き飛ばされる動画はおふざけが過ぎたものだと、メディアには説明された。
Officer Injured After Allegedly Riding On Hood Of Patrol Car

参考リンク
http://bridge-english.blogspot.jp/2009/05/horseplay.html  horseplay