I use Launchbar (https://www.obdev.at/products/launchbar/index.html) for this. It works system wide, I just select the word or phrase and tap the Option key once. This brings up Launchbar with that text inputted, and then I can send that off to Google, Wikipedia, the system dictionary, YouTube, or anything else. I love it because instead of having different convoluted keybindings for every different type of search (C-c / g, C-c / h, etc.) I only have one, and then dispatch off a fuzzy frecency search that takes <2 letters for the result I want. So tap Alt, Tab, g, Enter searches Google, while Alt, Tab, w, Enter searches Wikipedia, etc. It does tons more with this same paradigm, I use it more than the command line, and can't recommend it enough to people who like to optimize their computer use.