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1.
1. Engage in gang-related activity.

2. Commit unethical behavior or corruption.

3. Say disgraceful or damaging gossip.
If you can't afford to do dirt, don't do it. Really, don't do it at all.
by Mr. Terrence L. Trezvant March 12, 2006
 
2.
engage in gangsta activity, or kill for a gang
"when the OGs tell you to dirt, you better be down."
by steaks December 13, 2003