"Was in hog heaven" is an idiomatic expression that conveys a sense of extreme pleasure, contentment, or delight. There are several synonyms that can be used to describe this feeling, including "in seventh heaven," "on cloud nine," "over the moon," "ecstatic," "delirious," "euphoric," and "blissful." These words emphasize the intense emotional state that one feels when they are thoroughly enjoying something. Whether it's a satisfying meal, a comfortable bed, or a fun activity, using these synonyms can help convey the depth of happiness one feels when they are truly in their element.