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1.
To pollute the stream of a Twitter hashtag by tweeting a meaningless, satirical, or spamlike tweet containing the hashtag. Usage is comparable to googlebomb.
McDonald's marketers were horrified as #mcdstories, meant to solicit positive tweets about experiences at the restaurant chain, was twitterbombed with replies like "I ate a Big Mac and got the shits for 24hrs. #mcdstories"
by bselig November 07, 2012
 
2.
When people following you on twitter get mobile device updates from your tweets. Most humorous when they are all in the same room.
During our meeting, I tweeted how bored I was and unknowingly sent a twitterbomb to everyone in the room.
by kcsat0m1k February 03, 2010
 
3.
The act of posting one tweet after another, thus filling up your followers feed.
Jack just twitter bombed my feed. He posted seven tweets right in a row about the same damn thing.
by Nachtein January 24, 2012
 
4.
The act of tricking your followers into thinking they are about to see one picture but end up seeing something totally unexpected. Thus, owning the hell out of them.
You read your friends twitter saying "OMG My new range rover just got smashed by a pick up truck!! picture link"

You click the link expecting to see their new car owned but you end up seeing a black penis infest with herpes. You just got twitter bombed bitch!

Note: the picture can be anything random. Doesn't have to be grotesque.
by OMGjudelaw July 02, 2011