| Yes there is.
Usually people hook their index/middle finger under the string they want to pop and pull their fingers up. This gives a very sharp attack, but also sarcrifices speed. If you want a faster speed, instead of hooking the finger under a string and pulling it up, you can try to "pop" the string by pulling it towards your lower strings.
For example, I want to pop twice on my high C string, I still use the regular popping motion in my wrist, except my popping fingers don't hook under the string but they almost bend the other way... It's hard to explain. Watch some Victor Wooten videos, it'll help a lot.
Flea Pop = Bad
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Sig-neh-chure... eh?
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