1. Describes someone who you really wish would shut up for once

2. Describes someone who excels at keeping secrets and being quiet when they need to be.
(Definition 1)
Dave: Man, Randy really won't shut up will he? He shares way too much information!

Bill: Yeah, he's such a Zippermouth

(Definition 2)
Craig: Are you sure I can trust you with this?

Daniel: Of course, I'm quiet as a Zippermouth, nothing comes out of here unless I want it to.
by JimmyLikesBones February 23, 2022
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