That is the simple account of the motivation for the phenomenon of sound symbolism or echoism.

… as he suckled at her breast beneath the Welsh shawl. Tired but happier, Susannah Holmes remembered Mary's native logic when her name had been called. Oh well, cariads. One hell is as good as another.

Mebbe he tried to imitate Dick's tone of voice and told us it was raining.

He did a 720 off the halfpipe.