I'll kill you! I'll slaughter you and crush you! You bastard! Die!
Literal
Kill! Violently-kill, stomp-crush! Damn-you! Die!
Raw violent speech packed with intensifiers. ぶっ殺す adds the emphatic prefix ぶっ~ (from 打つ) to 殺す for 'beat to death.' 踏み潰す compounds 踏む (stomp) + 潰す (crush). ~てやる here is the hostile variant of the benefactive — not 'I'll do it for you' but 'I'll do it to you.' くそったれ is a vulgar insult. 死ね is the bare imperative of 死ぬ.