To jack off or masterbate. It origin comes from the vibrant red color the penile shaft takes on after a particularly vigorous rub-out session.
After the high school dance left Danny hot and bothered, he had no choice but to rub the rhubarb.
by Chicago Jeff October 4, 2006
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The act of sticking a piece of rhubarb into your vagina whilst someone nuts onto it
Me and Jeremy did the rhubarb and custard last night
by Boobmaster January 16, 2022
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Two words that can be used when you have forgetten key points in a statement or question.
#1: What are you wearing?
#2: Ehh... It's me fuckin'... Rhubarb custard

#1: What did umm... Rhubarb custard say about me in class today?
by n-deezy February 15, 2009
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A form of pill popular in early 90s rave culture, where extacy was supplied in yellow and green capsules, named after a popular song at the time. see also Dennis the Menace
"Hey man, what you got"
"I got some Rhubarb and Custards, deck one of these and you will have eyes like dinner plates"
by Jules W December 8, 2008
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“The suggestion that there was any cake is total rhubarb. And by that, I mean completely, unequivocally true.”
by Joe the Joe Face January 27, 2022
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Rub the rhubarb is southern suburbs of Melbourne, Australia, means basically "don't annoy me" or "don't piss me off$
With my uncle he always tries to rub the rhubarb
by Wombatmtb April 17, 2022
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Shootin the rhubarb, see you mate.

Comes from the common norn iron phrase "shootin the crow". Which means the same thing.
by Scoot_Ulster May 13, 2009
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