The penetration of a cellular phone into ones anus.
A back and forth motion is always applied in this act.
Buttifs are usually done with the application of lubrecation.
This is a form of sodomy and should be done with a professional. Make sure to consult a doctor before commit this act for it can cause --> runny ass,dry mouth,upset stomach,leaking tender thigh juices,bleeding anal cavity,massive dirreah,your face on you-tube,laughed at by the myspace community,parents disowning you and selling all of your items on ebay and calling you there 2nd daughter, and death.
Buttif ; verb