Machete- 

Stab stab STAB!

Melt- Like the opposite of freezing. Grab your flamethrower or volcano, and here we go!

Mentally- Like psychology used in a dark way >:)

Mob- A large group of people coming at you, breaking down your door, attacking you... interesting way to die.

Murder- ¯\_(ツ)_/¯ see Kill.