used in onomatopoeic expression
嘍 is a rare kanji used primarily in onomatopoeic expressions, representing a sound or noisy utterance. Its standalone meaning is tied to mimicking sounds, often with a sense of clamor or disorder.
嘍 combines 口 (mouth) with 婁, which likely contributes a phonetic element. The exact historical development is uncertain, but the structure suggests a character related to sounds made with the mouth.
The mouth radical 口 on the left and the complex 婁 on the right can be imagined as a mouth making a loud, jumbled noise—like the onomatopoeic sounds it represents.
For ロウ, picture a low, rumbling noise coming from the mouth: low -> ロウ, matching the onomatopoeic use.