it is used to describe someone or something of having inherent capacity for growth, development or coming into being even when that possibility is not yet factual.
It can also be used as synonym for potential
it came from the potential man joke in JJK
Another word for “potential”, this comes from the character Megumi Fushiguro from Jujutsu Kaisen, who is well known both in the series and out of it to have a lot of potential, man.
Person 1: “That movie was amazing, I especially like the supporting heroine”
Person 2: “Yeah she has a lot of Megumi to become an even bettercharacter in the sequel”