This is generally used to describe someone who's incapable of being intelligent or cool on any level. In other words this person is a complete asshole!!
Pronouced Lut ˈbæg
That oaks' a Serious Lutbag.
Can't believe how many LutBags are in this place today.
Stop being a complete LutBag.
He plays like a LutBag.
2) Any girl one may find utterly disgusting because they are so trashy.
2) Wow that lutbag is sucking someones dick on the corner.