A person who is spending less and less time waisting time, becoming more uptight. Can be contracted to negslacker. One who in in the act described above can be accused of negative slacking or negslacking.
Can be further contracted to negslackin'
Yo Kirk, man don't let this happen again! Becoming a negative slacker has been the downfall of many a gamer, podcaster and online social networker.
Joe, you've been working late every night lately.
Stop negslackin' the group and come bowling with us tonight. You need to chill.