Razor under the tongue and keep an ox with them
“ox” is slang for a razor.
With a razor (blade) under the tongue it’s concealed, meaning it can be smuggled wherever you go (okay, maybe not an airplane.) But it’s not noticed and nobody will know you have it until you need to use it.
It’s doubtful they’re keeping it with them for shaving…
To help improve the meaning of these lyrics, visit “Cheesesteaks” by Vinnie Paz Lyrics and leave a comment on the lyrics box