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1.
A joint made up of roaches from previously smoked joints.
John:Damn man, Look at all these roaches we got.

Dave:Let's roll ourselves some Dirty Joints.

John:LET'S DO IT!
by Sir.Davey October 19, 2010
 
2.
Combination of cocaine and marijuana rolled into a joint.
AKA- Coco Puff
A dirty joint is a joint laced cocaine.
by Maeve42 July 15, 2006
 
3.
Find one who is stingy with there weed..roll em a nice sized joint..insert finger in anus an smear juices on joint. Give joint to friend..ask them to spark it up an enjoy!!!!!
"Yeah Chris O. never shared..so i gave him a dirty joint yesterday"
by James Furgurson July 13, 2005