Sentence:  Mounsey also suggests that one poem in the volume further links Smart with homosexuality in its use of the term "<WSD>gingerbread-office</WSD>" as slang for a public toilet used for gay sexual encounters... If Mounsey is correct, then the later "History of Giles Gingerbread" may contain more than meets the eye, especially since its final poem is signed with the known Smart pseudonym, Tom Tagg. 
Meaning of the word marked with <WSD> tags:  (slang) An outhouse: an outbuilding used as a lavatory.