A derogatory, antivaxxing term used to describe someone who has received a vaccine that is perceived to be less effective than others. It is often used in a social-political context and relying on dubious or selective information.
Jane: Hey, which vaccine did you get?

John: I got the PB&J.

Jane: Dude! Don’t tell anybody else that. You don’t want to be treated as a second-class vaccitizen.
by MetaMaster3000 April 23, 2021
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