A vigorous, rhythmic, two handed blowjob or handjob. The twisting motion is similar to using a pepper corn grinder. "Pepper Cracker" describes the technique of using an up and down stroke with one hand turning clockwise and the other turning counterclockwise simultaneously.
I'm telling you man, that freak ho Lucy's got one mean Pepper Cracker. After she puts her hands on your dick you'll be picking bed sheet out of your ass for a week.