Difference between "bump" and "Last reply"?

1
I'm newfag here
2
You can reply without bumping a thread (like when putting "sage" in the options field).
3
bumo
4
You can also put "orregano" from the secret options field.
5
just duct tape her
6
That's one jiiiive tofurkey
7
i think you should stop bumping this thread
8
i think touhou should orregano this bread

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