American pop musician Casey Baer is set to release her latest single, the pop rock single ‘ptxd’ on August 4. A play on the term PTSD, PTXD stands for “post traumatic ex disorder” – the trauma a bad breakup can bring upon a person. Coming off a tour with German chart-topping pop rock band Tokio Hotel, Baer has been hard at work on her own music, which shows in her latest single, ‘ptxd’.