This is the elongation of a name for anyone who has a last name that ends in "berg". Basically, if you have the balls to bestow this nickname on any person you are telling them three specific things. first, that they are wonderful. Second, that they have a completely rocking body. Third, that they are the single most caring person on the planet. Use it wisely.
john: Oh my god did you see that girl help that other one out until like 6 in the morning
Jeff: Dude no way she has an exam in the morning
John: dude she totally did. She is so helpful, and good looking...what a Bergington