As seen in Futurama: The Beast With A Billon Backs, it is by far the rudest way to hang up a phone. One does this by placing the phone between the cheeks of the buttocks and slamming it back into the receiver. This works best when both parties are using a video phone.
"Issak was being such a dick last night that I crack slammed the phone on his ass!"
"Dude, he must have really been a dick to deserve that."
"Dude, he must have really been a dick to deserve that."
by C.R. Strenth October 20, 2008