- verb (to be willing) to perform fellatio. A male term from the 1950s and 1960s, used typically by college students or servicemen during the hippy period of sexual experimentation. The phrase, and indeed the practice, seemed to assume a real and symbolic importance in male sexuality in the USA, far greater than in Britain and Australia. The term has occasionally been applied to cunnilingus. (Since the 1980s the words skull or ‘some skull’ have occasionally been substituted for head.).