なさけないの・・・ボディスラムくらいで、そんな死にそうな声、ださないでよ。

・・・、、。

Don't be so pathetic… it's just a body slam, quit making it sound like you're dying.

Literal

Pathetic is-[explanation-の]... body-slam about-くらい [with-で], that-kind-of death-seeming voice, don't-put-out [よ].

ボディスラム is a wrestling move, from English 'body slam.' くらい with で after it forms a dismissive scale marker: '(just) that level of X' — 'with just X.' 死にそうな声 ('a voice (as if) dying') uses ~そう (stem-attached apparent) + attributive な to modify 声. 出さないでよ is the negative request form + よ for mild-but-firm friendly scolding. A flirty-teasing moment between wrestling practice partners.