I wasn't able to find a definitive etymology, but a number of examples from well before the Simpsons, the first of which is from 1925. The construction is called the -ma- infix. It seems to have roots in slave dialects, but the exact origin is unclear. Hope this site helps: http://listserv.linguistlist.org/cgi-bin/wa?A2=ind0504D&L=ADS-L&F=&S=&P=19247.