Can someone explain this snippet of code to me? [Answered]

It expands the head, if there's a BodyVelocity inside of it.

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function onDamage(Part)
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    if Part:findFirstChild("Humanoid") == nil and Part:findFirstChild("BodyVelocity") ~= nil then
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        Part.Anchored = true
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        if Part:findFirstChild("Mesh") ~= nil then
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            z = Part:findFirstChild("Mesh")
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            for i = 1,5 do
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            z.Scale = z.Scale + Vector3.new(1,1,1)
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            wait(0.05)

Line 1: Function, named onDamage.

Line 2: If the Part (the part that is touched) does not have a child named "Humanoid" inside of it and there's a BodyVelocity inside of it, then...

Line 3: Anchor the part, prevent it from moving

Line 4: If there's a Mesh inside of the Part (or a an object named part) then...

Line 5: Makes a new variable called "z", a shortcut to the mesh inside the part.

Line 6: "for i = 1, 5 do" tells us that the code is going to be repeated 5 times.

Line 7: (This is going to be repeated 5 times) the mesh's size is going to become 2x larger

Line 8: "wait()" means that the repeat is going to be put on hold for the time in the brackets. You can think of it as a "pause" before the next code is executed (in this case, another repeat, via the "for" loop).

Satisfied?