Re: Is there way to say 'HEY...'
Main-gauche is a parrying dagger, yes...and as the majority of swordsmen were right-handed (because being a lefty has always meant being the odd man out, to some degree...there's a reason all the handwriting classes teach a right-hand slant...), the parrying dagger was the off-hand weapon...the left-hand weapon.
I would imagine gauche, as a commentary on someone's etiquette, springs from the right-hand-elitism mindset...everyone's taught, for instance, that proper table manners includes holding the knife and fork in specified hands. If you're a southpaw, your inclination is to reverse that...so you're doing it wrong, somehow, even if it's only that you aren't hold your fork in the 'proper' hand. It's a breach of etiquette that only a lefty would make...hence, 'gauche'. And the term became widely accepted as a descriptor for violating 'proper' etiquette, in general...
The first part is verifiable, the second part is pure speculation on my part. But I'm pretty sure there is, indeed, an etymological connection between the two terms.
And to address the OP...Utsukushi is right. The best thing to do is just get back on and say, "Hey, sorry, things happened and it didn't go the way I expected and I'm sorry I was incommunicado for so long." Four months is nothing...I had a GM that went silent for over a year...got back on, sent out rMail messages to all of the players to apologize and ask if they were interested in continuing the game and express understanding if they chose not to...we ended up playing that game for another couple of years before we finally played to its conclusion (or, at least played it through as far as the GM had originally envisioned it going. I felt like there was plenty of story left to be explored, but it wasn't my game.)
Maybe not everyone will be happy to hear from you, or on board with the idea of tackling the game again...but those who do will be that much more invested in the game for it. And I know I've had a lot of GMs that just up and vanished on me...I'd have loved to have gotten at least some notification, somewhere along the line, of what happened...even if they weren't starting the game back up, just knowing that they were alive would relieve a little section in the back corner of my mind. So, go for it.