A wrapper usually refers to an interface. For example let's say you have a library that only works with C style strings. In order to use it with ease, you write a piece of code that converts all your monkey floats/ints/objects to a series of CStrings, feeds them to that library, fetches the response and converts it back to floats/ints/objects. That piece of code is what a wrapper is all about.
VBOs are Vertex Buffer Objects. They are a way of buffering vertex data inside the video memory for faster rendering. You can find more info on wikipedia: http://en.wikipedia.org/wiki/Vertex_Buffer_Object
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