Cow pyrography-

"Gail originally wrote this line: "I'm sick of this cow pyrography" but later changed it to the current wording ["I'm sick of the smell of burning hair."] because no one seemed able to get it right. Pyrography was a popular parlor craft around the turn of the century. It involved burning designs into leather with a hot stylus." Note by Warren E. Miller, Sharlot Hall Museum.
Gail Gardner was literate, which is more than can be said for some of those who pirated his poems.