I've implemented a few small toy languages before and Tabloid was intentionally sort of sketched out to be similar (expression-based grammars, whitespace-insensitive, recursive, etc.) so it was just mostly a matter of reimplementing those things with slight variations (the biggest being that entire phrases could be keywords). Doing so in JS made prototyping pretty fast.

I guess besides the fun of just the comedy of the idea I wanted to get back into JS (I haven't written JS in a while) and wanted a project I could fit into one night, so I sort of swizzled the language design so it wasn't super complex and doable in a few hours.