A nose. How fares your old trunk? does your nose still stand fast? an allusion to the proboscis or trunk of an elephant. To shove a trunk: to introduce one’s self unasked into any place or company. Trunk-maker like; more noise than work.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Trundlers * Trusty TrojanNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes