Is there some movie with a famous line along the lines of “Oh my God they’re breeding” or am I imagining things again?
Jurassic Park?
According to imdb:
Jurassic Park
Dr. Alan Grant: [finding egg shells] Oh my God. Do you know what this is? This is a dinosaur egg. The dinosaurs are breeding.
http://www.imdb.com/character/ch0002035/quotes
I thought it had something to do with the Kardashians…
Caligula
Graveyard Shift: “They’re breeding underground.”
Salem’s Lot: “They’re breeding on one another. The vampires are creating vampires.”
How To Get Ahead Ahead In Advertising: “They’re breeding in the sea.”
Screamers: “They"re down there breeding like rabbits and no one knows?”
That’s probably it!
The Andromeda Strain has the line, IT’S GROWING!!
Army of Darkness?
Ash: “Oh, dear God, it’s growing bigger!”
Groovy.
Now, I know these are about the Kardashians!
From Mimic (1996)
So it also joins the breeding trope.
The ST:Voyager episode in which Janeway and Paris turn into giant slugs . . . and breed.