It's rhyming slang for turd. Reminiscent of her fecal delivery on Mr Depps bed.
Had alot of nachos last night, I need to go do an Amber Heard.
To shit on someone's bed, for fun or out of rage. This verb comes from the infamous episode of the trial opposing Johnny Depp and his manipulative ex wife, Amber Heard.
Yesterday I had to do an Amber Heard on my mom's bed. She'll regret not letting me going out !