big’un 
In Appalachian and Southern talk, "big’un" means "big one." It’s a casual contraction that rolls together in mountain speech and is often used for people, animals, or objects.
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Hillbilly Dude Says...
Pronunciation
[BIG-uhn]
Meaning & Usage
- A large person, animal, or object (noun)
Elmer:
Estel:
- A grown child (noun)
Meemaw:
other spellings: big one, bigguns, big’un, and big’uns
★ "Big’un" is often paired with "little’un," giving a simple way to distinguish between siblings, kids, or sizes of things. ★
Origin
From the phrase "big one." In Appalachian and Southern speech, "one" often softens to "’un," creating forms like "little’un" and "big’un."
Notes
Still common in Appalachian families and rural Southern communities. You’ll hear it often when folks are comparing sizes - of kids, fish, dogs, or anything else.
Say It Like a Southerner
Said quick and easy, like one word: "bigg-uhn." The "one" part is shortened to just "’un."