Punexpected is a combination of the words "pun" and "unexpected." Therefore, it means an unexpected pun, whether it's something random and out of the blue or a pun you didn't even mean to make.
pun unexpected
pun unexpected
Phil Lester said that the answer was "blowing in the wind—trees." He did not intend this pun, so it was punexpected. See punintended for more.
by iemmanerd December 15, 2015