The combination of the names of Elijah Wood and Dominic Monaghan who met on the set of The Lord of the Rings. Rumors of a relationship popped up and now the term is used to refer to their relationship.
"Does that LOTR slash have anything about Viggo and Billy?"
"No, just Domlijah."
The pairing of the names Elijah Wood and Dominic Monaghan. Often in fanfic slash.
"I saw some hobbits snogging today."