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When you forget someone's name so bad you just make up a stupid sound and hope they don't notice you're a total idiot.
'Bye, haamushhnaagaa!' *hand over mouth* 'Wait, was that your name? No, that was my embarrassment.'
'I'll see you later, haamushhnaagaa!' *face red* 'Oh god, that was my brain dying.'
'Later, haamushhnaagaa!' *slams door* 'That was not a name, that was a scream.'