You can uninstall or removes an installed gis-osm package itself from Debian 7 (Wheezy) through the terminal,
$ sudo apt-get remove gis-osm
If you would like to remove gis-osm and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove gis-osm
If you use with purge options to gis-osm package all the configuration and dependent packages will be removed.
$ sudo apt-get purge gis-osm
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove gis-osm