Horse about
Definition 1 of 1
Pro Tip 1/3Playful Roughness
Implies loud and energetic play, often involving physical contact, not malicious intent. 
Be careful when you horse about with the little ones; someone could get hurt!
Pro Tip 2/3Informal Usage
Most appropriate for casual, informal settings, not for formal or professional environments. 
I don't think our boss would appreciate us horsing about during the meeting.
Pro Tip 3/3Childlike Fun
Often used to describe behavior that is typically seen in children or in nostalgic reference to childhood. 
The adults were horsing about in the pool like they were kids again.