If you want a little longer winded definition, read on.  This was a very popular expression six months ago but has died off to a degree.  The SP is expected to deliver an experience that parallels what you would expect in an encounter with a girlfriend.  Deep kissing (and lots of it), elevating you to a higher passionate level than you would generally expect.  Many SP's do not kiss on the lips, fewer allow DFK and fewest deliver a true passionate experience.  Acting is acceptable but it can be easily overdone.  Finding the best actresses is the toughest part of the equation.  Chemistry plays a major role, how well you hit it off right off the bat will determine just how much your mileage is going to vary.  Beware, most of the SP's claim to be GFE, but.........

Poke