Green’s Dictionary of Slang

on for phr.

1. keen on.

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[UK] in Punch 26 Nov. 252: I am on for booze and backy.

2. destined for, promised to have.

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[UK] ‘’Arry on the ’Oliday Season’ in Punch 16 Aug. 75/1: Well, I’m not on for Turmutshire, Charlie, not this time.
[UK]E.W. Hornung Black Mask (1992) 155: I’m on for any mortal thing!
[Aus]Sun. Times (Perth) 5 Sept. 8: Keep your meat-pies on that peanut, I think he’s on fer crackin’ up ther crib.
[Ire]Joyce Ulysses 271: He’s on for a razzle backache spree.
[Aus]N. Lindsay Saturdee 169: Conkey Mender! Is he on for Trix?
[Aus](con. 1941) R. Beilby Gunner 284: Say, she’s on for you [...] You going to have a go?
[UK]K. Sampson Awaydays 12: He’s on for a shag if he gets home early today.
[Ire]P. Howard PS, I Scored the Bridesmaids 176: [...] thinking I might be on for my rock and roll.

In phrases

on for a tater (adj.) (also on for a tatur) [SE on + Fr. tête à tête, an intimate conversation]

obsessed, fascinated, usu. used of a man who is desperate to talk to a woman he is attempting to pick up.

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[UK]J. Ware Passing Eng. of the Victorian Era.
on for young and old (n.)

(Aus.) complete disorder, utter chaos, a free-for-all.

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[Aus]N. Keesing Lily on the Dustbin 97: Now it is ‘on for young and old’. Sister had ‘a go in’ with her arch enemy from Accounts.
[Aus]C. Bowles G’DAY 29: Les gives her a right-hander. Maureen picks up the jaffle-iron and drops him. Then it's on for young and old and Shane ends up calling the cops.
[Aus]Smith & Noble Neddy (1998) 114: It was on for young and old, we were right into it. Dave and I just stood there knocking out fools everywhere. We barred no one.
[Aus](con. 1960s-70s) T. Taylor Top Fellas 83/2: They’d wreck the train [...] then it would be on for young an old.
[Aus]B. Matthews Intractable [ebook] [I]t was on for young and old. They piled into the cell but they kept hitting each other because they were in a confined space.
[Aus](con. 1943) G.S. Manson Coorparoo Blues [ebook] There was a ding-dong party in progress [...] wall. It was on for young ’n’ old, and the din was deafening.