HORSEPLAY
horseplay
(noun) rowdy or boisterous play
Source: WordNet® 3.1
Etymology
Noun
horseplay (uncountable)
Rough or rowdy play that can often result in unintentional physical harm.
Synonyms
• roughhousing
Verb
horseplay (third-person singular simple present horseplays, present participle horseplaying, simple past and past participle horseplayed)
To engage in horseplay.
Synonyms
• play fight
• roughhouse
Source: Wiktionary
Horse"play`, n.
Definition: Rude, boisterous play.
Too much given to horseplay in his raillery. Dryden.
Source: Webster’s Unabridged Dictionary 1913 Edition