Double entendre of abbreviations

School has become my life (which we have already established in a previous post) with only 14 more days left. I have finally finished all of my assessments and am working on their report cards and updating their cumulative records. Girlfriend was reading over one of the many checklists-specifically the cumulative record checklist when all of a sudden she busts out laughing...I mean uncontrollably laughing. I was lost. There was nothing funny about the list, it just list the order for each folder: school picture, immunization records, report cards, vision test, etc. So naturally the conversation went something like this:

Girlfriend: (still laughing) Have you read this?

Me: Um, yeah...

Girlfriend: Really? You read this and didn't laugh?

Me: Um....no, I didn't laugh. Is there a major typo or something?

Girlfriend: Yeah, or something. Read it again.

I began to read it again in my head and she stopped me, insisting I read it out loud.

Me: Staff, please double check the cumulative before going on. Mistakes make a mess for everyone, refer to the instructions attached if you are not sure about the cumulative process. There. What is so f*cking funny? (as girlfriend is dying laughing)

Girlfriend: Baby, that is NOT what it says!!! This is what it actually states, listen carefully. Staff, please double check the cum before going on. Mistakes make a mess for everyone, refer to the instructions attached if you are not sure about the cum process.

Me: You are ridiculous, you know that in the school world c-u-m is short for cumulative right, and it's pronounced with a long u sound...

Girlfriend: I don't care, it's funnier this way.