Liff superfan Joe Moorwood, who has contributed 29 liffs to Afterliff, has just published a book of his own: The Yorkshire Meaning of Liff. It contains such classics as:
A perfect retort composed an hour and a half too late.
To be pleasantly devoid of thought.
The tilt of an imaginary pint glass to ask if someone on the other side of a noisy pub wants a drink.
Joe was also on BBC Radio York (1 hour 37 mins in).