The narrow space that connects the crotch and anus.
"Jonah had a hairy cranus"
by kelly debris February 06, 2008
Cranial anus;Ass head.
Shut up Dave you fucking cranus.
by Jimmy Timebomb February 20, 2013
A well lifted piece of arse, angled for an anal interuption.
Vincent says to Danny "I have to say, I just love the way you did the cranus last nite, it got me all turned on"
by TKLEE October 01, 2006