A couple of something vs A couple of more something

[trungtran]

I have been learning about the expression “a couple of something” but I have noticed that people also use these two expression “a couple of more something” and “a couple more something” or even “a couple something”. So I wonder if all of these four expression have the same meaning or the word “more” in this context means “another two of something” or “a few more something”.

[Joe]

First of all, a "couple" means "two". But some people sloppily use a couple to mean a "few" (two, three, four).

I need a couple of pens.
I need a couple more pens. (I have some pens and I need two more.)
I need a couple pens.