Slang word for a sexual orgy.
"'Ow about we all come back to mine and we can 'ave a French, English, Irish, American, Korean omelette, oui?"
"A guy invited me back to his for an omelette last night. Ended up having a big orgy with loads of his friends. It was strange though, because he didn't cook me any eggs in the morning..."
"That was one crazy omelette we had last night"