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......