Now this, Al, as a somewhat of an expert linguist, could answer easily.
"Christmaskkuh is a portmanteau term," he drawled, delighted to talk about something which referenced his field of interest, of words and writing and more words. "Composed of two words to denote the combined, dual function, in this case of a dual occasion. 'Smog' is a good example of a portmanteau. Or, as another example..." he thought back on his previous conversation with Ronan and Ben, and glanced at Jamie with a proud grin "'shag' and 'fuck' will combine into a 'shuck'," he blinked and thought of it further. "Only, I guess, the double act of coi... er, making love, is not as common, unless you use the term to denote dual penetration. Or possibly an orgy involving more than usual amount of participants."