Googlewhacking is the activity: sitting at the computer and trying to find a googlewhack. The -ing form talks about the playing, not the one lucky result you hope to land. You still use two words, and you still want Google to give you exactly one page. It is the same early-2000s geek game, named from googlewhack. Informal internet English; you will rarely meet it now except as a piece of web history. Though actually, people sometimes blur the two words, but if you keep them apart, googlewhack is the find and googlewhacking is the hunt.

玩 Googlewhack