I think it was appropriated, if you’ll pardon the pun, from African American accents, but I’m only an amateur linguist noticing things and making connections, so in the cold light of science, my “think” is no better than your “almost definitely” :-)
Note: not fluent yet, please if you speak German correct me if my depiction is not accurate. “Bavarian German” does seem to drop a lot of the condiment sounds, and also seems to drift closer to Latin in some ways, but I haven’t had time to actually look into that.