I do it for the pun of it. His constant punning irritated her.
source: WordNet 3.0
A play on words which have the same sound but different meanings; an expression in which two different applications of a word present an odd or ludicrous idea; a kind of quibble or equivocation.
source: Webster 1913
verb
make a play on words
Japanese like to pun--their language is well suited to punning.
source: WordNet 3.0
To pound.
source: Webster 1913
To make puns, or a pun; to use a word in a double sense, especially when the contrast of ideas is ludicrous; to play upon words; to quibble.