Still getting used to the idea that since I can now post again, I can look again too (so annoying when you see a post you want to reply to, and can't).
Colloquilisms .... well I don't use them very much, as I don't know many (ras-de-bol I learnt in a French lesson before I came here, but have never really had the occasion to use it, except in my mind when doing the tax form!!), so I long ago decided not to bother with them too much. Even though everyone says I speak good French (well, I don't think I do, but certainly better than many English around here!), but knows I am not French I decided to keep it simple for me, and use the words I know.
I get the gist when French people use them, along with the rest, but maybe most of our French friends fall in to the better spoken brigade.
And yes, better not to use colloquialisms rather than use them and get them so wrong everybody laughs at you!!
ex W1, via 47 and 11 and now [just] in 34, equidistant from Carcassonne, Narbonne and Béziers, where I hope we'll finally stay!!