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.

c.1790
1790180018101820183018401850
1856
[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.

1709
1710172017301740
a.1749
[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.