Coldbeer?

In the southeast—Appalachia down through Florida and Texas—it’s common enough to hear a hot day beer referred to as a “coldbeer”; if we’re leaving it as a two-word phrase, it’s unmistakably a “*cold* beer”, heavy emphasis on the former. Anybody else heard it and have anything to add? Anybody know why it might have developed that way?

https://redd.it/1wwmvmy
@r_etymology