Best existingcomeback to the insult "Suck my dick."
It is often used to test the other person to see if they do present it and if they don't they will be called a "pussy".
If the other does in fact present it, proceed with an insult about his penis.
Presentaion:/ˌprɛz ənˈteɪ ʃən, ˌpri zɛn-/ Set number of agonizing minutes of exclusive divided attention (divided among you & your lousy slides, facebook, youtube, email, myspace, text messages, chats + other cool websites and iphone apps) intended for explaining to a group of unwilling students what took you 3 weeks to partially understand and one night to put on powerpoint.