Sentence:  When she thinks of having him inside her, her pussy grips and pulses like the mouth of a child that hasn't been fed. ... What begins as a languid glide accelerates into the stomping/pounding/<WSD>piledriving</WSD> frenzy of a mosh pit. 
Meaning of the word marked with <WSD> tags:  To make deep and rapid penetration in the fashion of a piledriver.