adj: Used in Edinbourgeois slang, often as a comeback.
When something (especially someone or something being said) has gone too far, is over-the-top, or silly; but still in a jokey way.
When said about something that's been said it is usually followed by "from you".
Alex says "Jane, You have a massive forehead, it makes you look like a donkey."
Betty says "Mate, Plenty from you."
After seeing something silly, Charlie exclaims "That's Plenty"
More than you might think, and less than you would presume.
"Plenty, means only one. Notify your dictionary editor".
"Plenty, is more than you think. But, more or less than that.."