The source is pulled from the gimp-edge PPA, with some fixes (i.e., cdbs removed as a build-depends for builds that no longer needed it)
Since the newer libgegl3 that GIMP needs requires a backported "real" ffmpeg (available in jessie-backports but not the OBS), and I already have a multimedia backports OBS repo with the latest ffmpeg, I just built GIMP 2.9.5 in that repo. If you add the repo per the following instructions, you'll see a lot of updates that are available. As far as I can tell, all should be safe to upgrade on a Jessie system, but there aren't any absolute guarantees. Just install gimp if you're not interested in the others.
Anyway, the instructions to add the repo are here: https://software.opensuse.org/download. ... ackage=mpv
Follow the instructions for Debian 8.0. The commands to add the key must also be run as root or with sudo, and if you download multiple keys for different OBS repos, any after the first one will be saved as "Release.key.(n)", so change the command to add the key to use the appropriate key file, which you'll see in the result from the key download.
I used aptitude to install it, though apt should also work.
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# aptitude install gimp=2.9.5.gitc29098e-0