According to the band's lead vocalist, guitarist and producer Chad I Ginsburg, "Replaceable" is a song "about anyone that gets in your way, holds you back or slows your potential with their own blatant insecurity, fears or sickness".

[1] Loudwire's Joe DiVita provided an overview of the song upon its release, describing that "A wah-drenched guitar lick sits in the background, easing in as thumping bass notes accent the opening moments, building tension before "Replaceable" explodes with a door-kicking "Oooh!"

The toe-tapping verse slides into a fun, horror-esque melody behind an instantly catchy chorus.

"[2] "Replaceable" was premiered exclusively on the Loudwire website on June 2, 2017,[2] and was subsequently made available as a digital download for customers who pre-ordered The Phoenix on iTunes.

[1] Alternative Press writer Philip Press hailed the song as "the blistering opening cut on [The Phoenix],[3] although Metal Injection's Greg Kennelty claimed that "I just can't help but feel like something is missing without [former CKY frontman Deron Miller's] vocals.