Okay, my friend plays Sax which is tuned to Eb, how would I jam with her?

Would I have to tune down till my "C" is an Eb?
No, she will just have to transpose her notes to match yours. She should know about this if she plays sax.
transposition, my friend
just lower the note names and itll be the same notes
like, her c is your eb
just change note names accordingly, or do it by ear
no need to tune down
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Because there is a bomb in the lasagna!

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make loud howling noises and throw your feces at them whenever they bring it up, I suggest that your GF does the same.