Citations:couplezilla

Noun: "(humourous) a couple who, in the course of planning their wedding, display difficult, selfish, narcissistic behaviour relating to the event"

 * 2010, dnl_upside_down (username), "Clever / Funny ways to tell friends about our engagement?", weddingplans.livejournal.com, 14 April 2010
 * Honestly, I'd be in the latter category, and I'd probably distance myself from any friend who put on a big production to announce their engagement... I'd be terrified that they're going to become Couplezilla over the whole wedding-planning process, wanting to have the biggest and best "OR ELSE!!1"?
 * 2011, "3 Things Wedding Photographers Can Learn From Lion Tamers", Jukeboxx Media, 29 June 2011:
 * Wedding photograph is a lot more complex than a few bits of equipment. It requires sharp shooting skills, solid knowledge of human psychology and the ability to stay calm in the face of an angry Couple-zilla. Building these skills is an essential pre-requisite to becoming a wedding photographer.
 * 2010, dnl_upside_down (username), "Clever / Funny ways to tell friends about our engagement?", weddingplans.livejournal.com, 14 April 2010
 * Honestly, I'd be in the latter category, and I'd probably distance myself from any friend who put on a big production to announce their engagement... I'd be terrified that they're going to become Couplezilla over the whole wedding-planning process, wanting to have the biggest and best "OR ELSE!!1"?
 * 2011, "3 Things Wedding Photographers Can Learn From Lion Tamers", Jukeboxx Media, 29 June 2011:
 * Wedding photograph is a lot more complex than a few bits of equipment. It requires sharp shooting skills, solid knowledge of human psychology and the ability to stay calm in the face of an angry Couple-zilla. Building these skills is an essential pre-requisite to becoming a wedding photographer.

Noun: (humorous)a couple - whether dating, engaged, married, common-law - in an emotionally fused relationship

 * 2004, Amy Alkon, advice column, Metro Spirit, Volume 15, Issue 25, January 22-28 2004, page 44:
 * Being accommodating does fly in the face of the traditional approach to relationships: two people coming together to squash themselves into one big couple-zilla — a whole that continuously becomes less and less than the sum of its parts.