What is "verbal diarrhea"?

[Starr]

English Language Tests, Intermediate level

ESL/EFL Test #602 "English Slang Idioms (344)", question 1

"John is an idiot. Everything that comes out of his mouth, in my opinion, is ......... diarrhea. It is either useless information or it is incorrect," Bill said to Paul.

(a) phrasal
(b) plural
(c) verbal
(d) dictionary

English Language Tests, Intermediate level

ESL/EFL Test #602 "English Slang Idioms (344)", answer 1

"John is an idiot. Everything that comes out of his mouth, in my opinion, is verbal diarrhea. It is either useless information or it is incorrect," Bill said to Paul.

Correct answer: (c) verbal
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what is verbal?

Starr

[Mister Micawber]

verbal diarrhea = talking too much and saying little of value.
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Native English teacher at Mister Micawber's