Prisencolinensinainciusol, a song by Italian Adriano Celentano, answers that question. Take a look at the video. What do you hear?
Inspired by the theme of "incomprehension," Celentano composed this song using the sounds of American English--and some actual English words--in a jumbled, nonsensical way. The result is a glimpse at what we sound like to someone who can't understand us.
When it came out in the early 1970s, the song was a big hit in Europe. For more background, listen to this NPR Interview with Celentano (November, 2012).
It's been a while since I was surrounded by people I could not communicate with. Does the song make you recall a time when you struggled to make yourself understood?