It's a really stupid term. I saw it the other day on a girls online dating profile saying she won't meet anyone who is a Trump supporter…and went on to say "I just can't support the dumpster fire". I've seen many women who echo the same sentiment. Muh emotions.
Fucking retarded. Even a dumpster fire is a self contained burn that burns out trash shortly, cleanses filth and doesn't damage nearby structures. Poorly thought out term. Wildfire would be worse, but doesn't have the cache.