Apparently, he was previously a cabin steward who used to rifle through grandma and grandpa’s jewels while they danced away on the Lido deck sponsored by Geritolux.
4-LOM’s programming glitch eventually got out of control, and Jabba the Hutt caught word about this legendary earring thief and necklace snagger. Hutty boy snapped a combat chip on 4-LOM (into his iceberg lettuce ball head?) and gave his programming permission to “harm sentients.”
He paired him up with Zuckuss, they joined the rebellion for a minute, then he ran into Boba Fett and was dismembered.
A cautionary tale of teenage cruise ship petty theft leading to ultimate dismemberment.