Doo has 2 meanings
Short form of "dude," which is used when referring to a companion; often used by males as a nickname for other males but females use it as well; surfers are often associated with the word.
Hey doo, what's up?
This page explains what the abbreviation "doo" means. The various definitions, examples, and related terms listed above have been written and compiled by the Slang.net team.
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Shortened form of doo-doo, a juvenile way of describing human or animal excrement; teenagers often use the shortened version.