When something moves by itself, like it is breathing.
A pussy that twitches and move when sexually stimulated by the mind and thoughts alone without touching it.
Johns arm pulsate after he finish lifting weights.
Rhianna's pussy pulsate during a hot sexy conversation with her boyfrriend.
Dang girl you made my pussy pulsate last night when we were on the phone. You had me so freaking hot when you said you can make me moan.