The phrase "most chuckling" describes something that evokes a lot of laughter. There are several synonyms that can be used to convey a similar meaning. For example, the phrase "very amusing" can be used to describe something that is very entertaining or funny. "Hilarious" is another word that can be used to describe something that is extremely funny. "Side-splitting" refers to something that is so funny it makes you laugh uncontrollably. Additionally, the phrase "riotously funny" can be used to describe something that is both hilarious and uproarious. Ultimately, there are many ways to describe something that is most chuckling, and the right word will depend on the context and audience.