Unintelligible or nonsensical talk or writing. (noun)
Highly technical or esoteric language. (noun)
Unnecessarily pretentious or vague language. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "gibberish" in a sentence
"Look up the term "gibberish" and tell me I'm wrong."
"Responding to trollish gibberish is like yelling at an automated phone answering service."
"Politicians have to be diplomatic, and pissing off Obama by spouting neocon gibberish is probably not a good idea."