"Prolly" is a slang word used in place of "probably." It means likely. ... "Prolly" is a way to spell the way the word "probably" is sometimes pronounced in casual speech. "Probably" is clearly a word that you would find in an English dictionary, but this "slurred" pronunciation would not be listed.
https://www.urbandictionary.com/define.php?term=Prolly
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"Prolly" is a slang word used in place of "probably." It means likely. ... "Prolly" is a way to spell the way the word "probably" is sometimes pronounced in casual speech. "Probably" is clearly a word that you would find in an English dictionary, but this "slurred" pronunciation would not be listed.
https://www.urbandictionary.com/define.php?term=Prolly
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