Self-explanatory. It's where you slap the keyboard with your hands to make up a name such as a username or name for a character.
I just did some keyboard slapping to make up my OC's (original character) name.
When I signed up for the website, I couldn't think of a username, so I just keyboard slapped it.
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When you slap your cock against your keyboard for 2+ hours in order to do the following actions:
1. Create an MLG video.
2. Create a "Shrek is love, Shrek is life" video
3. Anything else I guess is possible if Donald Trump can become president.
I wanted to send my friend a Snapchat, so I did a keyboard slap