1. It can be used to describe a multi-religious or secular holiday that purposely assimilates several religious traditions in an effort to be universally applicable (especially ones that are somewhat ignorant of the holidays that they are combining).
2. Or, as a comical salutation to wish a happy holiday to as many people as possible.
Similar to Chrinnukyulezaa and Chrinnukyulezaa.
"Good idea; let's see if they'd like to help us bake some gingerbread Ramadan cookies."
2. 'Merry Kwanzidanamistamas!'