1- Someone who is a psycho and performs lots of unusual sexual acts.
2- Fucked up in the head person. More disapproving than mezzed (messed up) in the head.
1- Jessica, ain't you going well with Jason? No, It turns out he is a sick bastard, who wants me to use different and weird sexual acts in bed every time we go to bed!
2- Hey, Watch out fuckhead...you should go back to driving school and learn how to drive all over again.