1. Somebody or something that forces itself upon you even though you don't want it there, and does outrageous things to impress you but you really don't want them/it there. Usually used to describe people who invite themselves over even though you aren't even friends with them.
1. Dude 1: Man, that Peter Bear guy invited himself over to our party, but nobody actually ever talks to him or hangs out with him. Then he did all this crazy stuff and totally killed the mood.
Dude 2: Man, he is so Dutch Snow.
2. Asshole: Hey man, how about tomorrow I come over to your party, you better get some extra breezers for me!
You: Don't be so Dutch snow man. GTFO.