Green’s Dictionary of Slang

kennetseeno adj.

[backsl.]

putrid, stinking, ‘off’.

[UK]Hotten Dict. of Modern Sl. etc.
[UK](con. 1840s–50s) H. Mayhew London Labour and London Poor I 23/2: Kennetseemo ... Stinking.
[UK]Sl. Dict.
[UK]D. Powis Signs of Crime 190: Kennetseeno Smelly, the stench of decomposition; sometimes said when a person breaks wind: ‘Kennetseeno!’ (London backslang for ‘stinking’.).