Green’s Dictionary of Slang

rasher n.

[ety. unknown; ? SE rash which results from rubbing or vertical bacon sandwich under bacon n.1 ]

(Irish) the vagina, sexual intercourse; thus ext. as rub of a rasher.

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[Ire]Share Slanguage.
[Ire]G. Coughlan Everyday Eng. and Sl. 🌐 Rashers (n): [...] female genetalia.