Top definition
A post in an online forum or message board that completely destroys a thread and its intended purpose.

The use of an unrelated comment, picture, video or other media that kills said thread. Usually after a thread bomb is dropped, no one posts in the thread anymore.
"OMG that dude posted a picture of a hairy cock in that bake sale thread."

"Shit got thread bombed, yo."
by triaxengine July 01, 2008
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