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......