You Can't Spell Slaughter Without Laughter was panned by most music critics. The album received a 0.5 rating out of five from Slant reviewer Nate Adams, who said "[It's] high in the running for worst album of the year ... The music aims for brutality and melody, but misses the mark entirely on both counts."Alternative Press reviewer Phil Freeman also gave the album a half star out of five, remarking that the album "truly fails because it has exactly zero memorable moments".
In a mixed review, John Lucas of the Georgia Straight said that the album "seems designed to test the listener’s tolerance", but that "those willing to embrace a noisy, ambitious, self-indulgent, and downright weird record will find a lot to love". Logan Broger of ChartAttack gave it three stars out of five, saying, "When the grind-electro-hardcore-pop duo aren't being obnoxious or comedic, there are some tunes that are actually good." Also giving it a three out of five, Sputnikmusic reviewer Brent Stephenson said, "The album is really just meant to be as obscenely ridiculous as it possibly can, and in that regard it is quite successful."