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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!
by L. Sosodef April 08, 2005
 
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?"
by thickduff December 21, 2004
 
2.
your big wang mate. (in other words: penis)
she whipped out me old boy and gave it a tug
by MD MACHINE December 18, 2013
 
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.
by Jabroni guy June 04, 2007