double talk
Meaningless speech, gibberish mixing real and invented words. For example, Some popular songs are actually based on double talk. [1930s]
Also, doublespeak. Deliberately ambiguous and evasive language. For example, I got tired of her double talk and demanded to know the true story, or His press secretary was very adept at doublespeak. This usage dates from the late 1940s, and the variant from about 1950.