The action of Julia Laughing is referred to when a person is laughing hysterically to hide the fact that they are actually crying. This can happen when someone may say something mean to you that upsets you but you don’t want to seem week so you laugh but as you laugh tears stream down your face.
Person: you fat hoe
Person 2: *starts Julia laughing because it hurt their feelings but they don’t want to show that*

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by lil jewwwww October 5, 2019
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A laugh that is both unnecessary and eccentric for the matter that the laugh is about. The laugh is usually loud and sounds kind of fake, with the laugher's mouth wide open.
Liz: I'll go down there, turn on the new Liz Lemon charm, a little Julia Roberts laugh. HAA HAA HAA HAA!
by r3ckl3sson3 January 4, 2011
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