The Hebrew in Psalm 73:4 that is translated as “their bodies are sound and sleek” or similar in English is literally “their bellies are fat” in its original meaning, which for instance the French Traduction œcuménique de la Bible translates directly: ils ont la panse bien grasse. Similarly, the Gbaya version translates this passage verbatim as “they are healthy and good fat sɛn-sɛn going along.” Sɛn-sɛn is an ideophone which refers to something shiny, glossy, or fatty.
Ideophones are a class of sound symbolic words expressing human sensation that are used as literary devices in many African languages. (Source: Philip Noss)