Green’s Dictionary of Slang

dine v.

SE in slang uses

In phrases

dine at the downstairs restaurant (v.)

[2000s] to have homosexual oral intercourse.

dine at the Y (v.) [play on eat v. (4); Y = the conjunction of the thighs, plus a pun on the YMCA/YWCA]

[1940s+] (orig. US) to perform cunnilingus.

dine in (v.)

[1970s+] (US gay) to invite someone home for sex (as opposed to picking up a partner for alfresco coupling).

dine out (v.)

1. [mid–late 19C] to go without a meal.

2. [1970s+] (US gay) to pick up a partner for alfresco coupling, rather than taking someone home.

dine with Duke Humphrey (v.) (also drink a health to Duke Humphrey, sup with Duke Humphrey) [Duke Humphrey’s Walk at Old St Paul’s Cathedral. The real Duke Humphrey of Gloucester was actually buried in St Albans, but a statue of Sir John Beauchamp, which stood in one of the cathedral aisles, was popularly supposed to be the duke; thus to dine with Duke Humphrey meant to frequent this aisle, in the hope, often vain, of being invited to dinner. The Scottish equivalent was dine with St Giles and the Earl of Murray ]

[late 16C–mid-19C] to go without one’s meal.

dine with St Giles and the Earl of Murray (v.)

[18C] to go without one’s dinner.

dine with Sir Thomas Gresham (v.) (also sup with Sir Thomas Gresham) [Sir Thomas Gresham (1519–79), founder of the Royal Society and a well-known philanthropist; the image is of a poor person forced to appeal to Gresham for charity]

[early–mid-17C] to go without one’s dinner.