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All roads are graded higher in the middle to promote water shed. Water collecting on roadways can cause problems for drivers and the road itself so it is engineered to drain away from the center giving it a domed appearance.

Also, in some aspects of the term, it could be the action of sucking on one's penis while the party is occupying a vehicle. As in, "That biddy gave me road dome last night drivin home."

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16y ago

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