What you just heard was a .44 caliber
Now you can fill in the blanks
Another great example of using humour to both leverage the pretty grisly nature of the song and to add dramatic impact to the rest of the verse.
It’s also a play on the word “blanks”; the blanks (practice rounds) Monch is referring to have been “fill[ed] in”, and are therefore legitimate rounds that can legitimately end you.
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