To the best of my knowledge, Boobledink first appeared in a "Nancy" comic book or strip by Ernie Bushmiller, probably around the 1940s. The story: Nancy and Sluggo were speculating on the consequences if the father of his country had been named George Boobledink instead of Washington.
Dr. Louise Hart has also used the word "boobledink", which she apparently coined independently sometime around 1980. In a 1993 book, she writes, "I made up a name - 'Boobledink' - to express mild displeasure. If ... someone would poke a finger in the icing of a birthday cake, I'd say, 'You Boobledink' ...."
"Boobledink" seems to be a proper noun in these instances, but I don't see why it couldn't be used as a common noun meaning something between a klutz and a clown.