on dead grandma

Definition

A phrase used to swear an oath or emphasize that you're telling the absolute truth—invoking a deceased grandparent as your witness to the truthfulness of a statement. It's the urban equivalent of 'cross my heart.'

Example Usage

On dead grandma, I'm going to that party no matter what my parents say.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=on%20dead%20grandma&defid=12175702)

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