Afirmative sexual availability.

If one is single, not in a monogamous relationship, or otherwise not exclusively attached, they are said to be fairdinkum. (it's fair to dink 'um)

To pork someone who is not 'available' would be unfairdinkum.

John has the hots for his best friend's girlfriend Sheila, but to bone her behind his buddy's back would be unfairdinkum. John must tell his friend that he saw Shiela hoing it up with the bouncer at a singles club, and later chuggin' cock in the back alley for free shooters. His friend should then break up with the ho. Now she's fairdinkum, and John can tap dat ass without fear of reprisal.

Linda: "Tom is so hot, I wanna ride him like a Jersey steer. Too bad he's dating Cindy... she'd rip my uterus out with her bare hands if she found out I boned him."
Keri: "You're in luck! As of last night, Tom and Cindy are on a 'break' ... he's fairdinkum!"
by Scarecrow05 April 19, 2006
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Australian slang; v, fair or true. To proclaim a fact or truth in a statement in such a manner.
Na mate, I'l tell ya what...the guy come roun he-gain..Il give to em right..bloody fair dinkum mate!"
by herbie January 22, 2004
To mean that something is truthful. Fair share of work, truth, or honesty. Not kidding. Not 'taking the shit', as it were.
Fair dinkum, would I lie to you?
by Coihandel April 04, 2003
Usually a term used to confirm the truth of a statement.
The origins of this term are disputed but a plausible one is that it came from the Victorian Goldfields where Chinese workers used the term Ding kum so confirm a deal that is honest and true.
Fair dinkum mate those shoes have seen better days.
by Parkmyute November 20, 2012
An Australian expression of disbelief.
John: "I got really pissed last night"
Bruce: "Fairdinkum!"
by Western January 09, 2006
(In addition to other definitions)

Incredulous disbelief, similar to bloody hell.
Fair dinkum mate, you didn't have to knock over the case of beer!
by youcantryreachingme June 06, 2005
1)Australian Slang Word to express suprise.
2)Statement of acknowledgement.

Similar term to "No Sh!t"
1)Person A - I nearly had a car accident today!
Person B - Fair Dinkum?

2)Person A - It's going to cost me lot of money to fix the car.
Person B - Fair Dinkum
by Melbourne Dude March 02, 2005
Originates from when Captain Cook first landed in Australia. When they used to drink the toast would be "Fair Drinking" and the saying has evolved from there.
"Mick that koala just scratched my nob off"
"Fair Dinkum Shane, you did piss on him"
by Pinkbum May 13, 2004

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