But now we are all using "mmmmm," as in "mmmmm...bacon," and I got to wondering where it came from. Googling gets me lots of info, including the fact that you can tag things "mmmmm" on Amazon. Only eight products, however, have been tagged, including Hapi Hot Wasabi Peas, McCann's Steel Cut Oatmeal, and Madhavi Raw Pure Organic Agave Nectar.
Did it originate with the Homer Simpson? This Web page suggests so. But maybe one of you remembers an earlier usage.