Watch the The Pivot online guitar lesson by Andrew Ford from Blues Bass Survival Guide
Pivoting is a technique used in grooves like a quarter note shuffle where you have a central note that you keep going back to as you are walking up or down. That note is typically the 1 or the 5 of the chord but could even be another note such as a muted note. It gives your bass line more forward motion and a bouncy quality. Here are a couple of examples in Ab.