Green’s Dictionary of Slang

rot v.

[rot n.1 /SE rot]

1. to talk nonsense; thus rotting n. and adj. [rot n.1 ].

[UK]Kipling ‘A Little Prep’ in Complete Stalky & Co. (1987) 184: Drop rottin’ for a minute. I want to find out about the Head bein’ where he was.
[UK]Magnet 22 Feb. 15: Bite a bit out of his leg, Grip, and stop his rotting. [Ibid.] 7 Mar. 11: I never thought he was rotting. I don’t see what he wanted to lie about it for.
[UK]Wodehouse Psmith Journalist (1993) 299: ‘He is indispensable, Comrade Jackson, indispensable.’ ‘No rotting.’.
[UK]‘Dornford Yates’ Berry and Co 51: I’m not rotting. It was real — something that mattered.
[UK]J.G. Brandon Gang War 112: ‘Don’t rot, Mac,’ Gilliver said uneasily.

2. to spoil, to interfere with, to ruin [i.e. to render SE rotten].

[UK]Kipling ‘The Moral Reformers’ in Complete Stalky & Co. (1987) 121: It takes the house-masters off their work, and it gives the prefects a heap too much power, an’ — an’ — it rots up everything.
D. Coke House Prefect 104: You can see Bob’s off you, and we don’t want to rot the whole thing up, just when he’s begun to be decent again.
[UK]‘A. Bridge’ Peking Picnic 323: I’ve got a complex about the whole business, and you know why. Well, that might rot it all up, at any moment [OED].

3. to tease heavily, to abuse, to denigrate; thus rotting n. [rot n.1 ].

[UK]H. Fludyer Letters 89: We all rot him about it frightfully.
[UK]Kipling ‘The Flag of Their Country’ in Complete Stalky & Co. (1987) 210: Look here, Turkey, you musn’t rot the corps.
[UK]Marvel 27 Oct. 391: Oh, don’t rot!
[UK]‘Ian Hay’ Lighter Side of School Life 181: Bless you, we don’t do any work; we just rot Duck-face.
[UK](con. 1900s) S. Leslie Oppidan 38: Hinting that there might be a sport taking the mysterious form of ‘rotting the Flea.’.
[UK]M. Arlen May Fair (1947) 189: ‘Look here, no rotting!’ he warned her.
[UK]C. Lee diary 14 July in Eight Bells & Top Masts (2001) 136: Every morning they [i.e stewards] get it wrong [...] So on Monday Ainslie and I thought we’d rot them up.

4. (US campus) to be irritating or unsatisfactory; usu. as that rots.

[US]Eble Campus Sl. Fall 6: rots – very bad or annoying or disappointing.
[US]Eble Campus Sl. Fall 7: that rots – that’s a bad situation: ‘I have two mid-terms tomorrow.’ ‘That rots.’.
[US]L. Rodríguez Always Running (1996) 10: The words ‘Efrain Rots’ had been emblazoned on a wall.

In phrases

rot about (v.) (also rot along)

(UK society) to laze around, to idle, to fool around.

[UK]J. Ware Passing Eng. of the Victorian Era.
[Aus]Bulletin (Sydney) 22 Aug. 24/1: I rot along from day to day, / Amused to see strong, foolish men / At toil. I’m not inclined that way, / For when I’m old (unless by then / I do a loaf beneath the mould) / I’ll draw my pension – when I’m old!
[UK]O. Onions Peace in Our Time 30: It was stupid [...] the way fellows rotted about, filling themselves up with a lot of drinks.
rot someone’s socks off (v.)

to defeat comprehensively.

[UK]K. Lette Llama Parlour 238: This would just about rot his socks off.

In exclamations