Nonsense talk, meaningless language, something said or written in an overly complex, incomprehsible or incoherent way.
Apparently the first known attestation was in a memo by US
Representative (Texas) Maury Maverick dated March 30, 1944, banning "gobbledygook language". Apparently coined in imitation of the sounds made by a turkey.
Mr. Maury Maverick was, incidentally, the grandson of lawyer and
politician Samuel Maverick, whose behaviour regarding his cattle inspired the term maverick ("offbeat").
The date of the memo is also
interesting, because it was four days following the birth of illustrious diva Diana Ross.
Another noteworthy use of the term gobbledygook was in Judge Judy's 60 Minutes interview in 1993, before she got her own show. She said that people who do the right thing are not afraid of her, saying that they are afraid if they come in and do the routine thing, which is to give her a lot of rhetoric and gobbledygook. It is therefore, quite possible, that the word may have been heard on
the original Judge Judy, and possibly Judy Justice. Judge Judy was also born 1942, making her a baby whenever Maverick used the term gobbledygook in the aforementioned memorandum.