please explain "mwah" and how to do it.

[moogboy]

being the super smart awesome people that you are, could you explain what "Mwah" is and how do i achieve this sound? i have a Fender Fretless Jazz Bass, so dont tell me i need a Fretless, cause i do.

[Jared Lash]

Lower your action, solo your bridge pickup, up the mids on your EQ, and pluck close to the fretboard - voilà.