Watch the Percussive Pop online guitar lesson by Dmitry Lisenko from Percussive Acoustic Bass (Foundry)
You can play a standard "pop" in many situations. It's just plucking a string with your index finger. In percussive style bass, I came up with an idea to perform pop and snare at the same time. That's what usually happens when you play with a drummer: we tend to play slap together with kick and pop together with a snare.
Basically, it's just like a string strum, we're just strumming the note on a single string with our finger nails. We have to mute all the rest strings. As with the standard slap, we will use the pop mainly on higher strings, G & D. Practice performing it by putting your thumb on the A string, at the same time touching E string, so it's muted as well. Now just try to play any note. If we want to add a snare sound to it, we have to hit muted strings with our hand heel at the same time. Try them separately at first. Then together. And also on the D string.