Short for Rubefin, an Amphetamine based substance given to kids that can't concentrate...gives a good high too when crushed and snorted. Similar to ritty but is of varying potency. Ask ignorant kids at bus-stops for their prescriptions and you're set!
Degen type - "Hey little dude, hookus your entire month prescription of rubies and I'll lay a 20 on ya"
Little ADDer - "Wow man, $20 is so much money! yay!"
Degen type - ".....sucker"
"When we got together, everything was so perfect and now everything is going bad and I think about everything I gave up for him. All my friends - all the rubies that I gave up.“