Definition: puckish \PUHK-ish\, adjective:
Whimsical; mischievous; impish.
"It happens that I had recently read an article on wordplay in the Smithsonian magazine in which the author asserted that some puckish soul had once sent a letter addressed, with playful ambiguity, to
and it had gotten there after the postal authorities had worked out that it was to be read as "John Underhill, Andover, Mass." (Get it?)"
- -- Bill Bryson, I'm a Stranger Here Myself
(I'm half way through The Mother Tongue, with many a laugh out loud moment. I find myself reading the word play aloud to the CATS, for want of a better audience.)