"Threadbombing" is posting an image (or images) with superimposed text in a forum thread; usually to illustrate a point. Often, the "threadbomb" conveys a humorous message of disdain towards the original poster or the entire thread.
That noob needs to read the forum rules. He's been threadbombing our board all day with his tired images.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug