Gerund Contraction

I'm working on a group project and a co-worker suggested a title that includes the word"Fishing". In an effort to make it more casual, we shortened it to the contraction Fishin' but then it morphed further into Fish'n'. (As in, She's my friend I go fish'n' with.)

While I understand the thought process here (if you can replace a G with an apostrophe, why can't you replace the preceding I with an apostrophe as well), but as the writer in the group, this struck me as incorrect. I've never seen a gerund contraction written like that. I also believe that 'n' is always a contraction for "and" so this spelling is misleading.

Is there a rule for gerund contractions like this? Has anyone encountered a contraction like this? Do you think this would be confusing to the average English speaker, especially ESL speakers?