verbose, talkative, mumbling
嚕 centers on excessive or unclear speech: being verbose, talkative, or mumbling in a way that makes words run together.
嚕 combines 口 (mouth) with 魯, which likely contributes the sound. The exact historical development is uncertain, but the structure suggests a phono-semantic compound related to speech.
A mouth 口 beside 魯, which looks like a fish 魚 over fire 灬 with a sun 日 on top—imagine a talkative fish cooking over a fire, its mouth moving nonstop, mumbling and verbose.
For ロ, picture a low, rumbling mumble coming from the mouth: low -> ロ, and the verbose talk just keeps going.