look up any word, like fellated:
 
1.
Masturbating from pr0n found on p2p servers like Kazaa and Napster.
"Where's Mike?"
"He's napsterbating, as usual."
by Anonymous August 11, 2004
 
2.
masterbating while taking a nap.... mostly for girls and their dildo's
hey suzie what did you do all afternoon....Well i was napsterbating for a while then i woke up
by jackamoe June 11, 2010