Blue screen (OF DEATH!)
Whenever one is so overwhelmed and need an indeterminate pause to process whatever is going on. It might also mean your computer broke and/or died.
Google. (verb)
Google it, I googled this. Pretty much just a relatively modern change in dictionary.
Not an idiom at all, but having a tiny internet in your hand is something modern culture deals with. . .
It's possible memes could be metaphors in picture format?