when you masturbate and you get a good feeling, your climaxing (pretend that's like climbing one step on stair case on your way to the top)
the more you play with it, the feeling will get better, (climbing another step of your staircase)
this continues on feeling good, better, even better than the last second.......
then your vagina muscles will pulsate (throb like a fast heart beat a lot) and this is an outbust of great feelings (being at the top of the stair case)
you reached the highest feelings your vagina can feel/reach.
some people make handicap faces (like me) during this adventure.
climax means stair case or ladder in greek