Well, simplest way IS to use Google. The other, more troublesome way is making a .gif yourself, like Qualna said.
If you decide to stick with Google, just learn how to use keywords. Example, if you use the keywords 'dead gif', to represent youre dying from waiting something you like so much, like ToS... youll get results like:
You can also try to put a spin on it, using 'dead anime gif' as keywords, and then:
Just be creative about.
@Nirimetus my hands are fine, thank you.