Green’s Dictionary of Slang

but adv.

1. (orig. Aus.) used (mainly) at the end of sentences to give added emphasis, ‘no doubt about it’, ‘absolutely’; e.g. He’s a nice bloke, but.

[Aus]Aus. Gold Digger’s Monthly iv 125: The hero (not a hundred fights, but) famed Whitechapel, doubtless considered such a feast of valour would greatly exalt him [AND].
[Aus]‘Steele Rudd’ On Our Selection 161: ‘Supposin’ the chap ain’t dead, but?’ Regan persisted.
E. Lowe Salute to Freedom 157: She had so few words to express her feelings. ‘I love you – won’t you kiss me, but!’.
[Aus]R. Park Poor Man’s Orange 27: ‘Stinking mongrels!’ said Delie strongly. Somebody called out, ‘What about them electric stoves they’re going to give us, but?’.
[Aus](con. 1941) E. Lambert Twenty Thousand Thieves 107: ‘Who’re we getting? ‘A real bastard.’ ‘Who, but?’.
[Aus]‘Nino Culotta’ Cop This Lot 23: Couldn’t do it in the time, but.
[UK]G.M. Fraser McAuslan in the Rough 11: It wis a smashin’ picture, but.
[Aus]N. Keesing Lily on the Dustbin 51: Australian women, more often than men, perhaps, have a penchant for ending statements with ‘but’. ‘I had a dreadful session with the dentist this morning, it’s been a nice day, but.’.
[Aus]R.G. Barrett Real Thing 192: Have a go at the price tag, but.
[Ire]R. Doyle Van (1998) 380: No, hang on, Jim, said Bimbo. I’ll get this one. It’s my round but.
[Aus]R.G. Barrett Goodoo Goodoo 172: Bird-eating spiders [...] They ’re good for brandy sales but.
[Ire]P. Howard Curious Incident of the Dog in the Nightdress 70: He goes, ‘Fix it, but’.
[Aus]D. McDonald Luck in the Greater West (2008) 1: What class ya got now? [...] I got commerce. I’m thinkin’ of waggin’ but.
[US]T. Black Ringer [ebook] n.p.: You wouldn’t send a guy with a face like Wayne Rooney after a lassie like this; he’d pure get his arse caned. [...] Not me, but.
[UK]I. Welsh Decent Ride 77: Jist tell ays if ye are [going to commit suicide], so ah kin gie the bizzies some story [...] Goat tae cover ma erse but, ay.

2. (US) used as an intensifier, e.g. but crazy, but cool.

[US]J.H. O’Hara Pal Joey 2: He [...] began making cracks but loud.
[US]T. Thursday ‘Base on Balds’ in Sports Winners Spring [Internet] She gave his long hair the twice over, but heavy.
[US]R. Chandler Long Good-Bye 16: Mr Potter is one person who but never gives an interview. How exclusive can you get, darlings? [Ibid.] 103: You don’t have any business here. Hit the trail, sweetie. Buzz off but fast.
[US]W. Brown Teen-Age Mafia 90: You try running off at at the lip [...] and you’ll get what the old guy got. But fancy.
[US]‘Randy Everhard’ Tattoo of a Naked Lady 20: We had to give him the blow-off but quick.
[UK](con. 1980s) I. Welsh Skagboys 13: Heavy stuff here the day but, eh?