Une grenade avec ça translates roughly as a grenade with that, and the humour comes from treating an explosive as an ordinary addition to an order. The clip circulates online as a Quebec French reaction sound, shared in short edits and soundboards where French-speaking creators use it to underline absurd escalation. Because the phrase is short, instantly quotable and easy to drop into a scene, it works beyond its original context as a shorthand for deadpan excess. Its appeal is the contrast between polite ordering language and a completely disproportionate request.