Horsing around

Idiom: "horsing around"

Example:
Mariela:  Minami, you really should pay more attention in your Idioms class. I don’t think you pay attention in class, you are always horsing around.
Minami: Horsing around? I don’t have a horse! I don’t even know how to ride a horse.  I take the bus everywhere I go!
Mariela: No, silly. Horsing around means goofing around and not paying attention.
Minami: Okay, you are right. I really need to stop chatting with Bruno and Sylvia in Idioms class and need to start paying attention to what the teacher says.  

Meaning: "horsing around" means to be goofing around, playing around. Not paying attention.

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