Hitting on a member of the opposite sex that your friend is involved with at any stage of a relationship. Generally early on.
1. Hey dude, you were talking to my girl Karen over there. Are you eating my rhubarb?

2. So you're facebook friends with my girl Karen now eh? Are you eating my rhubarb?
by -=Gunner=- November 16, 2010
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This term is used when a red-neck or skid is on a motorized vehicle and crashes it to the point of being thrown off the machine.
"I was goin third gear wide open when that badger popped in front'a me, tried goin 'round the critter and ended TITS UP IN THE RHUBARB!"
by Ruban June 1, 2007
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A ladies anus that has been destroyed followed by an anal cream pie that is pushed out via the valsalva maneouver ...
When that whore pushed out that anal cream pie, it looked like a rhubarb cinnamon bun.
by timmy tim timotei September 14, 2008
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Yes, its from the first Batman movie in 1989. It means stay the fuck away from my girl. It is part of the code. No friend of mine is allowed to talk to or hang out alone with my girlfriend unless they want the wrath unleashed upon them.
"What the fuck man? You took her out to dinner last night? Never rub another man's rhubarb."
by I'm Batman July 13, 2005
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Told to Bruce Wayne by the Joker. The Joker was refering to his relationship with Vicki Vale
"Never rub another man's rhubarb!"- The Joker(Jack Nicholson)
by Bruce Lee lives April 8, 2004
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When you go down on your partner in Guelph, ON AND as they climax, you slam a rhubarb pie (can be other fruit, but juicy rhubarb preferred) in their face.

Royal City Rubarb Pie a 'la mode is when you cum in her face after.
I went on this date last night and I totally wasn't expecting it, but as I was about to cum, he gave me a wicked Royal City rhubarb pie. It was the best I ever had.
by Bad Ass Fisherman August 20, 2010
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Can be used in two cases. One for the girls and one for the guys. When this is said to a girl, it means dont play with other blokes dicks. When said to a guy it means dont touch up my girl (rhubarb being a nice sweet dish when added with sugar, girls being nice and sweet)
Boys: Hey man, thats my girlfriend you're trying to impress. Stop it, never rub another mans rhubarb.

Girls: Hey there bitch what you doing? That guys coming on to you. Remember I'm your boyfriend, never rub another mans rhubarb or else. (fight)
by Si_B June 19, 2005
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