Brewer's: Cutler's Poetry
Mere jingles or rhymes. Knives had, at one time, a distich inscribed on the blade by means of aqua fortis.
Whose posy was For all the world like cutler's poetry Upon a kuife.
Shakespeare: Merchant of Venice, v 1.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894