(humorous, often attributive) A person overly concerned with ensuring that a wedding goes exactly as they envision it.
2007, November 6, alanG, Audreh SNUK, She wasn't in the family gathering to see Sarah's weddingzilla dress burn.
2012, Amy Alkon, "Advice goddess", Colorado Springs Independent, 11 April 2012:It can be hard for a man to understand how an otherwise sweet and reasonable woman can go all weddingzilla: "My dress must have a 50-foot train, trimmed with the skins of puppies!"
2013, Megan Garber, "We Have Ourselves a Groomzilla", The Atlantic, 23 April 2013:At least he's making Weddingzilla-ism slightly more of an equal-opportunity affair.
