Used when the speaker is intending to mean swollen or swelled, but lacks the education or the motivation to add the extra syllable. Does not appear in any legitimate dictionary. I've never heard it pronounced "shwoal" even in Texas, but as it's a made up word, I suppose you can pronounce it however you please.
I stubbed my toe and it swole up! (should be swelled)
Her toe is really swole. (should be swollen)
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