Liff, Loff, Laff and Shoeburyness

continuing from my previous post and back to Monty Python's The Meaning of Life, note the following:

After the film's title was chosen, Douglas Adams called Jones to tell him he had just finished a new book, to be called The Meaning of Liff; Jones was initially concerned about the similarity in titles, which led to the scene in the title sequence of a tombstone which, when hit by a flash of lightning, changes from "The Meaning of Liff" to "The Meaning of Life".^[2]

Note from The Meaning of Liff wiki page:

All the words listed are toponyms and describe common feelings and objects for which there is no current English word. Examples are Shoeburyness ("The vague uncomfortable feeling you get when sitting on a seat that is still warm from somebody else's bottom") 

 Now how would they get THAT out of Shoeburyness?! My Tou Sense on shoeburyness is that it's a "sinking feeling", like  when your shoes become buried in things like rising water, deep shit, or quicksand.