A person who only adds you to their list of bebo friends once they have achieved certain milestones in their lives, such as buying a house, getting married, achieving great success or travelling overseas. Normally this is only done to make you jealous.
Me: My ex Matt added me to his friends list yesterday to bebo brag.
Friend: Oh what has he done...?
Me: Just got married.
Friend: Bebo bragger. Loser.