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1.
positive term of address used to connote respect, wisdom and experience in a person, usually male who appears youthful
"What's goin' on old boy?"
von thickduff 21. Dezember 2004
 
2.
your big wang mate. (in other words: penis)
she whipped out me old boy and gave it a tug
von MD MACHINE 18. Dezember 2013
 
3.
From the movie "Oldboy" based from the Japanese Manga of the same name. Definition: "To have sex with your daughter, and you don't even know it while cutting your tongue out and getting hypnotized thinking your daughter is your lover."
You sicko! You are an oldboy!
von L. Sosodef 8. April 2005
 
4.
A pronoun used in place of a male name and usable in the role of both he and him.
Oldboy's gettin rage drunk tonight.
von Jabroni guy 4. Juni 2007