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2.
When someone is pissing you off really bad in study hall, but your holding something. So you use your free index finger to slap/cut them across the cheek. It's the most hardcore way to hold a soda and show someones who's big pimpin'.
The stupid boy would not leave the girl alone no matter how much she said she didn't care what he was talking about, So she fingerslapped him.
by Hunbelle March 30, 2009
 
1.
Slapping one's annoyance using a powerful whip-like thrust of one's fingers.
Maria finger slapped her annoying and obnoxious brother.
by STEFLOG February 20, 2009