Idiom - British - informal :خیلی خوشحال و شادبه عنوان مثال :Look at your sister out there on the field! She's happy as a pig in muck now that she's back in the team's starting lineup againمنابع• https://www.collinsdictionary.com/amp/english/happy-as-a-pig-in-muck+ عکس و لینک
