A play on "biting my tongue": used when refraining from typing something offensive on the Internet.
I'm biting my fingers trying not to respond to my uncle's Facebook comment about how much he loves Sarah Palin!
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When a person constantly shows you a "hilarious" new video on youtube, you say "you are biting my finger."
Sean: Hey Nate, you have to see this new video I found on youtube, it's hilarious. It's called...
Nate: Sean, "you're biting my finger."