Galloway’s brutal assessment of Mr Corbyn’s performance since last year’s referendum came after a caller lambasted the Islington North MP’s performance on Newsnight.
On Tuesday evening, Mr Corbyn was given a tough run as he failed to answer simple questions about Brexit.
Following Theresa May’s landmark Brexit speech, Mr Corbyn was questioned by presenter Evan Davis on key elements of the Prime Minister’s plans to leave the crumbling bloc.
Jeremy Corbyn was hammered by George Galloway for his wavering Brexit views
The Labour leader quickly floundered under the pressure, despite blasting Mrs May for her tough demands regarding Britain’s relationship with the European Union, saying “it seems a very odd way of approaching a constructive relationship with the whole continent”.
Speculating on what would happen if Parliament voted against Mrs May’s plans, the BBC host asked: “Do we have a second referendum? Do we stay in the EU? Do we ask the Prime Minister to go back and negotiate another deal? What do you understand happens?”
But all Mr Corbyn could say was: “Well, we’re quite a long way from that situation,” before explaining that negotiations had to happen first."
And after being grilled further Mr Corbyn could not provide an answer and instead attempted to deflect the questions.
I'm getting fed up
The talkRADIO caller has no sympathy for Mr Corbyn after the shambolic performance as Galloway was forced to admit he was reaching his limit with the politician’s leadership.
He said: "When the history of this people comes to be written, Jeremy Corbyn's failure to remain principled on the issue of the European Union, and at the very least, after the people had voted for Brexit, his failure to pick it up and run with it and reap the political rewards, may come to be seen as his final failure.
"I still am a defender of Jeremy Corbyn – but I'm getting fed up.
“I’m getting frustrated by a number of things, and one of them is he needs to be much better, a level of energy and vibrancy in taking his case to the people and I'm just not feeling it."
Evolution of Jeremy Corbyn's beard
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The evolution of Jeremy Corbyn's beard in pictures
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Jeremy Corbyn's beard evolution 1982-2015
It comes as Tristram Hunt used his last Parliamentary speech on Wednesday to issue a dire warning to Mr Corbyn as he said the opposition party’s official positions were out of touch with traditional voters over Brexit.
Mr Hunt plunged Labour into further chaos last week as he announced he was quitting as MP for Stoke-upon-Trent, sparking a by-election in the Leave constituency.
During the speech, he also against a “divergence of priorities” between Labour’s policy positions and those of heartland voters, as he said: “The division of opinion between the official Labour party position and many of our heartland voters has served only to highlight some of the deep-seated challenges which centre-left parties are facing.”