Damage Can Be Spammed, and I Can't Figure Out Why?

So basically whenever you hit the player you can keep on clicking the weapon which deals damage, I want it so you can only deal the damage 1 time if the weapon is activated?

Any Ideas Why My Script Is Doing This?

server script in Tool

Av = script.Parent.DamageValue.Value --Attack Value 
local CanDamage = script.Parent.CanDamage
tool = script.Parent

function tagHumanoid(humanoid,killer)

    if humanoid and killer then

        local tag = Instance.new("ObjectValue")
        tag.Name = "Killer"
        tag.Value = killer
        tag.Parent = humanoid
    end

end

script.Parent.Activated:Connect(function()
	
	CanDamage.Value = true
	
	if script.Parent.Handle.Touched then
		
		script.Parent.Handle.Touched:Connect(function(p)

	local plr = game.Players:GetPlayerFromCharacter(tool.Parent)

	if script.Parent.CanDamage.Value == true and p.Parent:FindFirstChild("Humanoid") then

    script.Parent.CanDamage.Value = false

    local humanoid = p.Parent:FindFirstChild("Humanoid")

    humanoid:TakeDamage(Av)

    tagHumanoid(humanoid, plr)

    wait(.2)

    script.Parent.CanDamage.Value = true

    if p.Parent.Humanoid.Health < 1 then
        print("Player Has Died")
    end

    end
		end)
		end
end)

What MrLonely1221 said is right. You state

wait(.2)
 	 
script.Parent.CanDamage.Value = true

after setting CanDamage.Value to false, thus you can deal damage every 0.2 seconds. To fix this, just never set CanDamage.Value to true. Only do it in the beginning of your function, like you have.

Further more your indenting scares me. http://blackmiaool.com/lua-beautify/ can help you learn how to indent and make your code 10x prettier.