Abbreviation for "needle-dry handjob." Usually an act performed by girls no better than above average looking (or lower) who are often fake-drunk sluts. The end result leaves the victim feeling like his dick has been run through a wood chipper.
Bro A: Dude sick hu the other night, bet you got your dick wet.
Bro B: Nah man, awful NDHer. I got shredded, prob out of commission for a week.