An acronym for "Holds Knife Like Pen," used to describe the table manners of a lower class or uncouth person trying to imitate what he believes erroneously to be the behaviour of the upper classes at table. As the acronym suggests, the knife is held as though it were a writing instrument.
Dishevelled, rakish, disorderly, or unkempt. Used of hair, neck ware, or one's general disposition. Opposite of "rectilinear-biff." Origin unknown, but possibly derived from a misunderstanding of "skew-wiff." Usage peculiar to Brasenose College, Oxford.
"My word, Terence, with your tie at that angle, and your obvious bed-head, you're looking unusually skew-biff!"
"Don't worry: I get myself rectilinear in no time."