Carrying out several tasks at the same time, none of which are easy but none of which are impossible, whilst in circumstances which are not particularly favourable to completing the task.
It's like juggling turds with wet hands!
A fictional character prone to daydreaming and fantasy. Currently in the news in the UK after a government official compared a UK intelligence worker David Kelly to Walter Mitty. Dr Kelly then killed himself, sparking the Hutton inquiry which will probably be a whitewash and Tony Blair will cling to power for a little while longer. Tosser.
He is a Walter Mitty-style fantasist!