It’s simply an argument. You can call it whatever you want. while firing, you just need to specify the argument you’re sending. Also, I do not recommend putting cuss words into your scripts. Roblox sometimes checks scripts afaik, this could get you in trouble.
Example:
game.ReplicatedStorage.Event.OnServerEvent:Connect(function(player,arg1)
if arg1 == "dothis" then
-- code
end
end)```