When someone takes 2+ bottles of laxatives then puts a tampon in their anus. Once the tampon is filled with liquid shit they bake it into a chocolate cake for their significant other.
My wife gave me a dirty Bethany cake for my birthday.
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When a woman collects and inserts spiders into her vagina, covers her breasts in cat vomit and sacrifices a bird to her demonic god all as a ritual to find a partner for a dirty Joshua.
"Dirty Bethany" is when...
Joshua - "Ah fuck what's that smell?!"
Bethany - "Ah right, I left that dead bird on the alter. I was halfway through a Dirty Bethany last night when the spiders started to escape."