A skullclamp is a fiercely painful erotic act in which one partner inserts his head into the urethra of the second parter (obviously male) and then has the second partner attempt to
squeeze the first partner's temples with his penis while
fingering the anus of the
said first partner.
Dude, me and Zack tried the Skullclamp last
night." "
yeah, how'd it go?" "well, he'll be out of the hospital by
noon tomorrow......