They see a ring (on a person) and become possessive over it (the person) and covet it above all else. This can also make them a vile wretched person, of a lownature, slinking in dark places.
Best advice, toss them into a volcano and keep on walking.
"Why is Mike stalkingLisa's Facebook all day? Oh she just got engaged and he's lost it, dude's got Gollum sickness."
To pluralize an already plural word or otherwise add unnecessary /s/ phonemes to wordses like Gollum often does. For example, "We like goblinses, batses and fishes. But we hasn't tried Hobbitses before. Is it soft? Is it juicy?"
Word just tried to Gollumize my paper's title to "What Are Phenomeses?"
When one goes into a tizzy as a result of a great deal of frustration and is no longer able to control their words and bodily functions, almost like a seizure but not quite as severe. More like a mental break down. They start talking in a low deep voice (sounding much like the character Gollum from LOTR) to themselves trying to debate how they should handle the situation. A higher tendency in girls rather than boys, most golluming is due to a boy messing with a girlshead.