Green’s Dictionary of Slang

(orig. US) a long sexual orgy.

1999		B. Franklin ‘The Soft of Towels’ GSPOT 4 Nov. at BrianFranklin.com 🌐 You will no longer have to make plans to fuck. You could fuck all the time! It will be a fuck-a-rama! At least that is what you hear her say in your head.
2003		goforit.com 🌐 There’s more action in the locker room than on the ice in this all-male fuckarama.