That's an... interesting question!
To be honest, it's not biologically possible for a human (or any living being) to literally become a pineapple. Pineapples are a type of tropical plant that grows on a stem and has a specific set of characteristics, such as prickly skin, juicy flesh, and a tough core.
But if you're asking in a more figurative sense, I suppose you could interpret "being a pineapple" as embodying the qualities that pineapples are known for. For example:
* Being sweet and welcoming (like a ripe pineapple's juicy flavor)
* Having a tough exterior but a soft