I use to play like that sometimes, but I've been working on removing that "hand slap" I (mostly unconsciously) do on beats 2 and 4. Anyway, I think the reason why I (unconsciously) have developed a technique like this, is that it's a way to mute the notes exactly at those beats, it emphasizes the feel of the groove and makes it easier for me to play in time. But as I said, I've been working on getting a cleaner sound and to mute a bit softer...
If you want to learn this, put on a funky drum loop and do a hand slap at every 2nd and 4th beat. When you have gotten into the groove, play for instance this simple pattern over it:
Code:
1 2 3 4
|------x-----------x------|
|------x-----------x------|
|5_____x--3--5-----x------|
|------x-----------x------|
___ = sustained note
x = right hand slap
numbers above the tab line = beats
That should get you started.
