Like most normal human males…
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Mortar shells? uhhh I'm not sure what mortar shells he's been around or how he's cooking that meat but those are two sounds that should not align.
Mortar shells are fireworks
Better but still not how your grill should sound...
The grill doesn't sound like fireworks, but using it reminds this human of holidays that are associated with both meat cooked over an open flame and fireworks. 4th of July in the US is what the meme is talking about.