John S. Farmer, Slang and its analogues past and present…
“ Cf., to hang one’s gib. Giblets, subs. (common) .—1. The intestines generally; the manifold (q.v.) . Cf. trouble-giblets. 1864. Browning, Dramatis Personæ, ‘Flight of the Duchess.’ Is pumped up briskly through the main ventricle, And floats me genially round the giblets. 2. (colloquial) .—A fat man; forty-guts (q.v.) . Also Duke of Giblets. To join giblets, verb. phr. (venery) .—To copulate. Also to have or do a bit of giblet-pie. For synonyms, see Ride. Hence to cohabit as husband and wife; to live tally. Cf., plaster of warm guts. 1785. Grose, Vulg. Tongue, s.v. ”
