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1.
Used to describe the event in which an online personal user account has been hijacked without the user knowing, usually by a friend or aquaitance in a jovial or informal manner and whereby some obvious OR subtle change has been made to derive humour to a wider audience.
Dan: my user account said "Dan just went skiing and loved every second" but now it says "Dan is a gaylord and indulges in sweet love making with bald queens". Man, i just got logbagged!

or

Dan: awww bloody hell, i just got logbagged by Jonah... changed my profile picture to that picture of a dead horse
by crispynugget August 02, 2009