Green’s Dictionary of Slang

seat n.

see hot seat n. (1)

SE in slang uses

In phrases

seat of honour (n.) (also seat of shame, ...vengeance)

the posterior, the buttocks.

[UK]‘Peter Pindar’ ‘Pair of Lyric Epistles’ Works V (1812) 134: Behold him seiz’d, his seat of honour bare.
[UK]B.H. Malkin (trans.) Adventures of Gil Blas (1822) II 166: My seat of vengeance was firked most unmercifully.
[UK]W. Combe Doctor Syntax, Wife (1868) 273/2: While with his spade the conqu’ror plied / Stroke after stroke, the seat of shame, / Which blushing Muses never name.
[UK]Exeter & Plymouth Gaz. 23 June 3/2: The fives of this Knight of St Patrick having alighted near Easton’s ‘seat of honour,’ a part especially protected by the wrestling code.
[UK]Egan Bk of Sports 190: Dobell, in the heat of the moment, struck the hero of Bridgnorth on the seat of honor [sic]; when the latter cried out ‘foul’.
[US]Ely’s Hawk & Buzzard (NY) Mar. 22 1/3: [A] ‘Bang-up’ sort of fellow who would rather wear the widow’s deceased husband’s coat, than winter through with his seat of honour exposed.
[UK]‘Paul Pry’ Oddities of London Life II 277: ‘I heard you thay [...] that you would kick my—seat of honour’.
[US]Whip & Satirist of NY & Brooklyn (NY) 12 Mar. n.p.: [He] took him by the seat of honor and the scruff of neck.
[UK]Era (London) 6/36/3: He slipped, and fell upon his seat of honour.
[UK]Punch xxxi 213/2: Now I can vouch that, from the earliest ages to [...] those of the present head-master, they have, one and all, appealed to the very seat of honour.
seat of pleasure (n.) (also seat of love)

the vagina.

[UK]N. Ward Compleat and Humorous Account of Remarkable Clubs (1756) 268: Who bedding some prepost’rous Punk, / Mistook the downy Seat of Love, / And got them in the Sink above.
[UK]‘Roger Pheuquewell’ Description of Merryland (1741) 15: ’Tis a pleasant Place, much delighted in by the Queens of merryland, and is their chief Palace, or rather Pleasure Seat.
[UK]Cleland Memoirs of a Woman of Pleasure (1985) 25: Her sturdy stallion [...] produced naked, stiff, and erect, that wonderful machine which I had never seen before, and which, for the interest my own seat of pleasure began to take furiously in it, I star’d at with all the eyes i had.

In compounds

seat-polisher (n.)

(Aus.) an office worker, a bureaucrat.

[Aus](con. 1943) G.S. Manson Coorparoo Blues [ebook] A seat-polisher who’d got a long way by arselicking. Career men, they called people like him.