The action of holding your thumb to your middle and ring finger and leaving your index finger free to slap against the middle finger, creating a very sharp clicking noise in rapid succesion (speed varies by agility with performing the hand flick finger slap).
the action of 'hand flick finger slapping' is usually used when saying the word 'sick' or 'brap' or it can even be used with non-verbal accompanyment when you are excited and have no other outlet to let the world know that what you just experienced was too good for words.
D: mate did you just hand flick finger slap?
J: yeah i did, what's up with that? I finger slap all day bruh, what's your problem?
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