We let her in on secret meetings She held the secret in her hard little hands We'd never guessed she'd be a snitch Little did we know, deception was her plan I wasn't sorry to say that purple pustules hurt Spelling words of betrayal on her face I know it might sound harsh She won't forget, 'cause we left scars She's a sneak, Marietta's a sneak Maybe she'll see what's important in the end Maybe she'll learn how to be a better friend Marietta's a sneak, oh, Marietta's a sneak We let her in on DA meetings She learned the true Defence Against Dark Arts But if I see that witch again I might just blow her perfect little world apart Oh, Marietta, how could you deceive us? We even showed you your Patronus I know it might sound harsh We won't forget, 'cause we left scars She's a sneak, Marietta's a sneak Maybe she'll see what's important in the end Maybe she'll learn how to be a better friend Marietta's a sneak, oh, Marietta's a sneak I know that purple pustules hurt (She's a sneak) I know that purple pustules hurt (She's a sneak) I know that purple pustules hurt (She's a sneak) And Marietta's a sneak I know that purple pustules hurt (She's a sneak) I know that purple pustules hurt (She's a sneak) I know that purple pustules hurt (She's a sneak) Oh, Marietta's a sneak I know that purple pustules hurt (She's a sneak) I know that purple pustules hurt (She's a sneak) I know that purple pustules hurt (She's a sneak) Oh, Marietta's a sneak I know that purple pustules hurt (She's a sneak) I know that purple pustules hurt (She's a sneak) I know that purple pustules hurt (She's a sneak) And Marietta's a sneak