Here is Flea with an amazing slap bass video.
He talks about funk and then shows you how to slap bass with his own style of Funk bass lines with a punk intensity.
Many of the Red Hot Chilli Peppers older songs had loads of slap bass guitar in them and he shows many mind-blowing examples. He also plays them slowly so you can figure them out and play them.
Have fun watching this slap bass video!