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Related to blab out: blab around
To talk about or reveal a private or secret matter. A noun or pronoun can be used between "blab" and "out." I can't believe you blabbed out the plans for her surprise party right to her face! Don't tell your little brother anything you want to keep secret because he'll definitely blab it out.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
blab something out
Inf. to speak out freely about something that is a secret. Don't just blab it out! Don't blab out the names of the people who were there!
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.