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Purposely grotesque word for vagina. Usually used in abstract metaphor. Heard almost exclusively in rural areas of the US, particularly in Montana.
"That pipe was harder to pull out then a stiff prick from a lardbucket"

"So I pull down her pants and damn her lardbucket was nasty"
by gonnagetmesomepoon August 25, 2009
A fat fuck, someone who is larger that you'd prefer them to be
Man that bird's a lard bucket
by alishabeth June 12, 2008