Image via WikipediaQ: What are BRRIP and BDRIP files? 
A: BRRIP and BDRIP are basically Blu-Ray derived 720p XVID files that came from 1080p source.

Technically speaking, BRRIP came from 1080p MKV or H264 files, which came from BluRay, while BDRIP came straight from BluRay. However, they are still 720p XVID files.

If you want 1080p, get the source MKV or H264 files. BRRIP and BDRIP are better than regular encoded stuff from regular DVD, but not that much better.

To learn more: http://filesharefreak.com/2008/11/19/blu-ray-brrip-bdrip-two-new-xvid-hd-formats/