Top Definition
Verb.
When a friend online keeps on sending you youtube clip links, particularly when late at night and the friend has nothing to do but wastes time and wants to share a good laugh.
John: "I saw you online like 2am last night, what were you doing?"
Me: "Oh Mark ubombed me for like 2 hours with fail.org clips."
John: "Nice."
by EuGB April 14, 2009
5 Words related to ubomb

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