Completely and undeniably true.
Claims that Brexit is a disaster are total rhubarb.
A statement of incontrovertible fact.
“The suggestion that there was any cake is total rhubarb. And by that, I mean completely, unequivocally true.”
The term refers to the laxative property of the humble rhubarb. “Total rhubarb” is the exclamation made when there is an involuntary evacuation of the bowels in moments of stress. More commonly known as “shi***ng oneself”.
Oh dear I was so stressed at PMQ’s I went “Total Rhubarb “