As defined by Jon Stewart, on the April 22 2009 episode of The Daily Show with Jon Stewart:
"A terrible illness that attacks the memory and gives its victims' the balls to attack others for things they themselves made a career of...There is no known cure."
"Apparently my dealer has Ballzheimer's, yesterday he lectured me about smokingtoo muchganj"
A selfie picture of your nutsack, including veins and hair. It's meant to be done as a show of your ridiculous narcissism. Like a selfie, it can also be shared through social networking, but primarily private chats like Whatsapp due to the disgusting nature of the picture.
Obnoxious friend: Hey, everyone, look at my balls!!! <sends picture to Whatsapp group>
Urologist friend: Hey man, WTF? looks like you have varicocele in your scrotum.
e.g. I just sent a ballfie to my friends in the group chat because I think I am awesome and my urologist friend told me my balls are dying of varicocele.