to copy and paste/steal a tweet without the source's prior knowledge and/or permission. Note that it is different from retweeting because retweets give the real author of the tweet due credit. In the unfortunate event that the culprit/tweet thief is caught, he will be subjected to cyberbullying of an intense nature and more often than not called the B-Word.
Derived from the 2010 Christopher Nolan movie Inception starring Leonardo DiCaprio as Agent Dom Cobb, who was an expert in the art of extraction of unaware subjects' thoughts and ideas by invading their dreams.
''Dude, did you just dom cobb my tweet for the fucking fifth time?!? Oh, Ima block your ass!''