Green’s Dictionary of Slang

Remington n.

In phrases

give a Remington (v.) [a Remington double-barrelled shotgun]

to have two penises in one’s mouth.

[US]L. Kramer Faggots 359: At last he has his Irving, plus an Ike, two cocks with big heads in his very own mouth, which is known as Giving a Remington.