gelt?

Since my formative L2-immersive experiences were in Austria and Baden-Württemberg, I developed the habit of saying gelt? (actually, gell?) in place of nicht or nicht wahr? I used to have more of a southern German accent generally, which I've long since shed almost entirely, but gelt has stuck somehow.   

Yesterday I heard J finish a sentence with gell? for the first time. I'll have to make sure to also use nicht/nicht wahr more often. ;)