"Biddy" is actually a very interesting word because it has two separate origins, both fairly well-documented, which is unusual for a slang term. The primary meaning of "biddy" is "chicken," and it first appeared in the early 17th century. The word probably came from the nonsense syllables used to call chickens -- something like "here biddybiddybiddy," I suppose. By the late 18th century "biddy" had been adopted as a derogatory slang term for women, much in the same unfortunate way that "chick" was in the 1960's.
However, "biddy" in this sense might have died a welcome death had it not been for the influx of Irish immigrants into the U.S. in the early 19th century. Young Irish women often had their passage paid by upper-class American families, for whom they would then work as domestic servants while they paid off their debt. The practice was so widespread that such women came to be known as "Biddies," from a shortening of "Bridget," a common Irish women's name. This use of "biddie" reinvigorated the word, and ever since it has been employed by insolent children to torment their elders.
Sometime in the last 20 years or so, the term was recycled to mean a woman of any age. The connotation may exemplify the earliest expression synonymous with the concept now known as MILF.
"The old biddy is playing bridge"
"I'm trying to pick up a biddy"
Yo Hodges, there are madd bitties at ja's dawg.
In Australia a biddy is a two-for-one McDonald's voucher. It usually entitles the bearer to enjoy two delicious Big Macs for the price of one, but can apply to other items, such as fries and cheeseburgers.
Hey Cletis, some man in the street gave me a biddy! Looks like the whole family will be eating tonight!
Chicks, babes, or females.
We got to get us some biddies to hang out with tonight.
In Australia, a biddy is a really cool and attractive person who appreciates 2-for-1 McDonald's vouchers
Hey biddy, I got given a biddy today - you couldn't get more value if you tried!
lets go out tonite and get with some biddies
a dumbass bitch, usually 18 or younger. picture it: short shorts, ugg boots, string straight hair and mad eye makeup for a high school frosh. they go out at night looking for the party so they can get shitty on mikes hard, cheap wine, or other people's alcohol. they have a bun on the top of their head as if they rolled out of bed looking like a pre-pubescent prostitute. being a biddy means being dumb is the cool thing to do.
"look at all those god damn biddies. i can see her tities through that sheer ass abercrombie shirt."
"is that biddy wearing uggs in the summer?"