Try saying this, Serval-chan!

Fook... Fook lens joo!! Original uses fulanzi ("rotten kid"), as a hilarious second-hand phonetic transcription of Japanese furenzu.

Nah, that's not it. You need to roll your tongue to pronounce the R!

Well, excuuuuse me for being a Japanese serval...

You can do it! This is an important step towards deepening our friendship! Come on, one more time!

Fu... Fu... Fook... Furen... FRANZ!

...That ended up becoming a completely different word...

Oh, come on, quit your bellyachin! I'm tryin' my best here!

Sigh, that's alright. Let's switch over to this one! Try saying this word, Serval-chan!

...Fuck.

Fulaoer, "Hold your dick". Also a common joke pronunciation guide for English "flower" among sniggering schoolboys.