It's a promotional sex move, in which you endorse your sexual advances as if it is an infomercial.
"I gave her The Pitchman last night, she loved it so much, her pussy was soaking up my pre-cum like a Sham-wow!"
"Tired of messing with douche bag guys that just can't make cum? Well, get my Finger Buster! I will give you not one finger, not two fingers, but three whole fingers in your pussy! And if you cum now I will throw in an extra 10 minutes of clit busting action for free! You can't lose!"