Just try to say "enunciate" without articulating the word!
So, for your reading pleasure, here are just a few of my favorite examples of onomatopoeia. I pared down my list just to keep it simple, but as you can see, I am a geek when it comes to words!
First, as featured by the picture... Smug,
and how about.... Lewd,
and last but not least, Ruminate (as in, hope you enjoy ruminating over these fine words!)