Check this out first: How To Play Slap Bass: Part 1. So now that you know what slapping is, how do you do it?
Use the side of your thumb to strike the thickest string (E). Your thumb should make contact on the side of the knuckle and it should make a thumping noise. This takes lots of practice, just getting it to sound right.
Once you are comfortable with the E string, move up to the second-thickest string (A). I remember this part being very hard when I was initially learning slap bass. Don’t get discouraged, and continue practicing. After you can slap the E and A string, try the D and the G (G is the thinnest string).
Now, it’s time to build up your technique. Play the tab below and let the strings ring out. When you slap one string, it shouldn’t “mute” the others! It is important to establish dexterity and accuracy. No sloppy playing allowed.
Next, try this tab out. It uses octaves, like many popular slap bass riffs.
Awesome. Now, continue practicing and try learning some different songs that have slapping in them, or write your own material. You’re well on your way to becoming a well-rounded bass player. Keep practicing.
Any questions? Comments? Let me know below!