Top definition
A deliberately provocative or inflammatory posting on Facebook, MySpace, or other social networking sites that has the sole intention of inciting an online argument. Such postings often dare others to repost or give them a "thumbs up" by challenging the viewer's patriotism, religious faith or sexuality.
This Facebook posting is total Thumb Chum: "Cannibalism is awesome! If you don't repost or like this, you are un-American, hate Baby Jesus and are gay!"
by Boggamemnon January 07, 2011
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