"Doing a Heidi!" is a insult that is directed at someone when they are acting like Heidi Rawling!
Heidi refers to being bitchy, annoying and generally high pitched! :P
Peace out!
"OMG your doing a 'Heidi'!"
"I'm what?"
"Such a Heidi!"
"Oh you mean Heidi Rawling?"
"Yeah"
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