Romanian (or limba română in the language itself) is a Latin-derived language related closely to languages such as Spanish, French, Italian, and Portuguese.
A neat overview from Unravelled about Romanian. Romanian is Slavic a bit like English is Romance: although the core aspects of each language are Romance or Germanic, respectively, they’ve both been heavily influenced by a language from a different Indo-European subfamily.
Romanian is best known in internet culture for being the language of the Numa Numa song (Dragostea din tea), although that’s from 2004 so it probably qualifies as a vintage internet meme by now. (Do people still remember Numa Numa?) Anyway, you can (re)watch the video and see how much Romanian you can pick up – it’s probably not a lot, even if you speak another Romance language.
And if you want an even more obscure Romance language, you could always go for Romansh, the least-known among the four official languages of Switzerland.