Yea

A: I was thinking about getting a butterfly tattoo about yea big on my ankle.
B: No.
Do you think “yea” here is a typo? Or it does have its meaning here?

It’s not a typo. In spoken English, we use “yea” accompanied by a hand gesture to describe the size of something.
From wiktionary:
"Adverb

yea

Thus, so (now often accompanied by a hand gesture)

The pony was yea high."

https://en.wiktionary.org/wiki/yea

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It is so colloquial, and it’s so hard to make the accompanying hand gesture in writing, that I wasn’t aware that this word is spelled “yea”. I’ve spoken it but never written it. I would have spelled it “yay”.

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Means ‘this’ and refers to size. Pronounced ‘yay’ or ‘yae’. ‘His coffin were yae [indicates size] big.’ - quote from Phoenix Nights.