without looking at the dumpster in question I'm going to assume that "mama's milk" is just that person's tag name. People choose wacky names sometimes. Like someone in my area is apparently named "sand-bbq" and another just named "tooth." I saw one giant tag on the side of a train years ago, like an elaborate piece across the whole train car, that said "Syrup Shark" and that has been stuck in my head ever since as probably the best tag name of all time. The winner for worst alias of all time is definitely the tagger remüv, best known for tagging the opposite side of the prominent BE SOMEONE piece over the I-45 in Houston. Well it's probably not the worst of all time, but it's obnoxious for me personally to see the words 'remüv "hate" :)' when i'm already annoyed by driving a car in Houston.

And I think that's beautiful.