You know when sometimes people strum and they make this click? How do you do it? Can anyone link me to some video tutorial?

It's not the string slap I'm talking about where you slap the bottom part of the fretboard with the side of your palm.
well you could switch pickups to the neck pickup. usually you just flip the toggle switch all the way up. that might do the trick. unless your talking about palm muting... im not really sure what you were talking about when you said the whole hitting the fretboard with your palm...