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Telling a person to Lick your grundle is a better way to say kiss my ass. It a disgraceful thing to say to one nonetheless necessary if someone is being annoying and this insult fits nicely. Itรขยยs lets one know that what they said is so stupid or rude the next step for them to lick my grundle.
Tom: Hey I heard u made a 43 on your math test ur so stupid
Me: How bout lick my grundle jackass