Maybe Dom meant 'buss,' an old-fashioned word for 'kiss,' though I can't see a mouth that eats worms, raw fish (probably raw orc) and ring-fingers being very kissable. Especially before the invention of the toothbrush.
He might have meant 'bus' as in bus-boy, the guy who cleans up the mess off the tables in a restaurant after a meal. Gollum certainly qualifies as a mess, as do most bus-boys. I don't think Gollum would leave food spatters all over him, though, even if they were from other peoples meals. I don't think he'd be that picky.
Actually, there is a single shot of Gollum in Moria peering over the top of a ladder rung (or something like that) during "Fellowship" where his eyes sort of glow like the headlights of a bus.
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He looks like a bus because he has big shiny eyes like headlights.
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This may actually be the reason.