Used in the context of writing school/uni/other misc malarkey essays.
When your teacher gives you a stupid topic to write about, or one of which you can write, say, only 200 words for what the teacher believes should be an 800 word essay, what do you do?

You pad.
It's the stuff between the words, that turns a 100 word draft into a 1500 word essay. It keeps the teachers happy and doesn't require much effort.

For instance:

'He said the mars bar tasted great.'
...could be turned into something like:
'The candy confectionary known as a "mars bar", which is manufactured by Mars Inc., a subsidiary of Effem Foods, was consumed by smokngoat and then described by the same smokngoat as tasting great, which is fairly likely under the circumstances.'