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to easily annoy someone on a chatroom or on any [Instant messaging] or [social networking site] like Facebook, MySpace, etc. by typing "lul" really fast and pressing the return button on the keyboard. you say "LULTRAIN SUCCESS!" if [the person] gets easily mad or angry. It is referred to the lultrain because you say "lul" like the form of a train going on and on and on.
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