Fun fact: In Japanese there is no "Si" sound and the closest is "Shi", so "Siri" is pronounced "Shiri". You know what else is pronounced "Shiri" in Japanese? Buttocks (尻).
https://www.wanikani.com/kanji/%E5%B0%BB
> Now that you have nine flags inside your butt, you have to get them out. But, you don't know how to. So you ask Siri (しり — shi-ri), "how do I get nine flags out of my butt?"
(Note: The kanji is composed of the radicals "nine" and "flag", which is how they get to "nine flags".)
(Note: WaniKani's mnemonics are very often somewhat non-sensical slightly entertaining stories in the same style as this one. Very normal.)
I don't entirely agree with that system, so I often look up the individual radical meanings anyway and add a synonym, but that's Wanikani's method.
If you use a hard r 'Siri' translates to "garlic-i" or "you're a garlic"