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.