A bubbler is a common term used mainly in the Midwest region of the
United States, referring to drinking fountains.
I believe that the slang became popular due to the creation of a
drinking fountain that bubbled water out in a different manner than a traditional drinking fountain, although I do not know exactly which way this was.
It may be nothing, but the name Ford comes into my mind when I say this.
Wisconsin citizens' use of this word, and other abnormal slangs led to a study into how
Wisconsinites speak in 2005 or 06.