Green’s Dictionary of Slang

(orig. US short order) two poached or fried eggs.

1910		Ocala Eve. Star (FL) 20 June 1/5: ‘Poached eggs on toast,’ says a customer. ‘Bride and groom on a raft in the middle of the ocean,’ shouts the waiter.
1923		El Paso Herald (TX) 31 Jan. 8/2: For two fried eggs there are various terms [...] ‘bride and groom,’ ‘straight up two’ and ‘two moons looking at you’.
1934		Weseen Dict. Amer. Sl. 288: Bride and groom – Two eggs. ‘On a raft adds the toast’.
1949		Monteleone Criminal Sl. (rev. edn) 33: bride and groom on a raft Two fried eggs.
1953		Berrey & Van den Bark Amer. Thes. Sl. (2nd edn).
1960, 1975		Wentworth & Flexner DAS.