Mr. Winkie is the main antagonist from The Wind in the Willows, part of Disney's 1949 film The Adventures of Ichabod and Mr. Toad. He is the leader of a gang of weasels who tricked Toad into trading his estate for the motorcar that they had stolen. He is most likely a human version of the Chief Weasel from the original story.
Winkie is a wily barman who keeps a tavern that the weasels visit the day Toad decides to try and barter with them for their stolen motorcar. With no money, Toad, playing right into the hands of the sneaky weasels, offers a trade: Toad Hall for the motorcar. Winkie signs the drawn-up contract as a witness. When Toad is brought to court, he calls Winkie as a witness to corroborate the seemingly-outrageous account of that day, certain that he'll get him off the hook, and even goes so far as to elaborate on his so-called "unimpeachable honesty". However, Winkie turns traitor on Toad by implicating him as trying to sell him the stolen motorcar. Toad is subsequently sent to prison.
On Christmas Day, when Toad escapes and rejoins his friends, Angus MacBadger arrives to tell them that the weasels have gathered at Toad Hall for a raucous party, with their ringleader being none other than Winkie, in possession of the Hall's deed. So, that night, the four friends invade Toad Hall via a secret passage and try to make off with the deed while Winkie and the weasels are in a drunken slumber, ending up as a dangerous chase and game of "keep away" between each other. In the end, the friends escape, Toad in possession of the deed.
What becomes of Winkie and the weasels is not seen, but it can be theorized that they were sent to prison after Toad's name was cleared.