Green’s Dictionary of Slang

Auntie Nelly n.

the belly.

1957		G. Kersh Fowlers End (2001) 268: My daisies I bullock’d for two pig’s ears / To warm my Auntie Nelly.
1971		J. Jones Rhy. Cockney Sl.
1981		P. Wright Cockney Dialect and Sl. 99: For ‘belly’ you have the politer choices pot o’ jelly, Auntie Nelly.
2001		M. Coles Bible in Cockney 14: God then said to the snake [...] you’re gonna have to crawl around on your Aunty, and you’re gonna eat dirt and dust. [Ibid.] 86: It don’t go into your stop-and-start but into your Auntie Nellie.
2003		B. Dark Dirty Cockney Rhy. Sl. 19: My Auntie Nelly is so big I can’t see my shoes.