The party first met Burito in the Academiae. Even back then he was fat; they last encountered him in the Balsam Wood chewing a goblin’s ear off as a crazed response to the class’s final test.
More recently, at their 3-year class reunion, Burito came under the possession of a yet-unknown Magus of great power. Though himself a mere Sleeper, he used a bit of magic himself to disrupt the reunion and attempt to kill several of the attendees, including Nero Faxon. Strangely enough the spell he was under was not enough to keep him away from the fondue bar.