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 "omfgla~ roffles'. It is used to end teh sentences or by itself. Liek la~ or Omfgipkuirlkthxula~ Always accompanied by teh ~
slip of the tongue perhaps,
Those idiots who drive around in a ridiculously raised pick up truck, making a top heavy vehicle even more top heavy and unstable
A:*gah*
B: "Whats the matter"
A: This dam prickup is blinding me.
B: Stupid thing's, as if there lights weren't blinding enough as it is.