“shingling” is the (fairly rude) term of art.

'term of art' means that there's a specific meaning inside a particular sphere of discussion for this term (which has normal sense elsewhere).

To accuse a research group of shingling means that you think that that group releases a lot of papers one after the other which have a lot of overlap between them and back-cite each other-- and that this is done to artificially boost publication count and citation count to make the group look prominent.

Cool, thanks, I did a quick search but nothing came up - I assumed it was something scatalogical :o)