Internet slang for reviving a discussion thread.
Definitionen
(Internet, informal) Used in an online forum or chat to push a post or thread back to the top of the list. Bump—anyone else interested in carpooling tomorrow?
Used attributively before nouns (e.g., bump cap, bump stop) therefore treated as an adjective.
Definitionen
Used before another noun to denote something designed to absorb or relate to impacts or raised surfaces. He replaced his hard hat with a lighter bump cap.