coulda, woulda, shoulda
An informal phrase used to dismiss someone's regrets or worries about a past experience. I wish I had given myself an extra day off before going back to work after my vacation, but coulda, woulda, shoulda. A: "Should I have said more during that presentation?" B: "Eh, coulda, woulda, shoulda. It's over now, so there's nothing more you can do."
if it was a snake, it would've bit you
A phrase said humorously when one is looking for something that is right in front of them. Come on, your watch is right here, Liz! If it was a snake, it would've bit you!