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1.
Is like Solid which is a solid form of weed resin, crystals and other bits of a marijuana plant. But Dirt Bar has many other ingredients to make it dirty i.e car tires, petrol, bits of plastic and any other materials that can make it weigh more and also look and bit like a bit of dirt. It gets you high but it isnt too good for you and it isn't da best high but if you have only got a fiver then its good as its cheap.
Chris "Shit!! man all i got is enough money for dirt bar"
Jophis "Don't worry i'll chip in for some green"
Chris "Dirt Bar will never be good enough for Magic Man, Seisograph And The Masked Pretender".
by Eli-Joby February 06, 2008
 
2.
Slang for polluted cannabis resin, comes from name soapbar
"No bud around at the moment, I cant be dealing with dirtbar tho"
by stonah November 01, 2004