gif caption roughly means:
"Why you so rude... I thought we were friends..."
Whoosh or Vzhuh is a Russian meme - magic cat who casts evil spells and breaks everything.
Headkon was born out of the word "headcanon", in which "canon" was shortened to "con". And since "con" sounds like "kon" which in Russian means "horse", we have this. Cubedoge has something to do with Dogtown. Both are local dreamDB memes.