adj

• (computing) Containing data needing to be written back to memory or disk.
  "Occasionally it reads the sector into a dirty buffer, which means it needs to sync the dirty buffer first."
• (slang) Carrying illegal drugs among one's possessions or inside of one's bloodstream.
  "None of y'all get into my car if you're dirty."
• (informal) Used as an intensifier, especially in conjunction with "great".
  "He lives in a dirty great mansion."
• (slang) Of an alcoholic beverage, especially a cocktail or mixed drink: served with the juice of olives.
  "dirty martini"

verb

• (transitive) To make (something) dirty.
• (transitive) To stain or tarnish (somebody) with dishonor.
• (transitive) To debase by distorting the real nature of (something).
• (intransitive) To become soiled.
  "The markers for the slow line signals have been arranged at cab level, but for the inner fast lines they have had to be kept low in the "six-foot", with the result that they tend to be badly dirtied by passing traffic."