That retard better watch her buttside... that looks like three bosses aimed at her at once...

Why are Touhou and Monster Hunter refrenced together? Is it just a phase of japanese culture I never really got into, or something in Monster Hunter or Touhou that refers to the other...?

It's usually called a parody, and nothing but an artist's whim is needed for one to happen, so no, there's not necessarily any connection between any two works being parodied.

Why does Yukari make me think of TakoLuka?

Because she's a giant octopus tree rock thing in this picture. Or at least I'm guessing she's supposed to be Yamatsukami.

Yamatsukari

Ugh, can you imagine a nargacuga with 2 tails?

I can't stop laughing