Like many other phrases that really have no meaning, la~ can be used in a variety of ways. The most common of these would be lighten a phrase that may otherwise be taken as mocking or cruel. It can also be used by itself to express indifference.
Teh coolest word evar! It is teh la~ It's liek "omfg la~ roffles'. It is used to end teh sentences or by itself. Liek la~ or Omfgipkuirlkthxula~ Always accompanied by teh ~
May I have an order of regular degular buttermilk pancakes? Without all the added jazz? Hold the blueberry smiley face, strawberry glaze, chocolate chips and whipped cream.