One euphemism that took me a while to understand and perplexed me was le canto el gallo. The rooster sang to her. I was eight and in Puerto Rico for the summer when I heard it for the first time.
The phrase is a cliche now: I got the rug pulled out from under me, but when you've had it really happen to you it really does make sense. It's that moment when you’re standing there, looking around and taking things in and you suddenly get yanked off your feet unexpectedly landing on your ass and wondering WTF just happened.