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1.
A very lazy guy who falls asleep at the slightest availability of comfortable seating position.
" Omar is a slumberjack. He falls asleep as soon as he hits the couch......."
by ShazzSpazz October 28, 2006
44 8
 
2.
A lumberjack who passed out from lack of sleep and killed himself with his own chainsaw
" Joey was a lumberjack few days ago. Now he is a slumberjack "
by ShazzSpazz October 30, 2006
30 19
 
3.
Someone who falls asleep wearing flannel (shirts, pajamas, etc.) or uses a flannel blanket.
Melvin: Can you stop slumberjacking already, Johan? We gotta be at the bus station in 10 minutes!
by Ill Semar October 01, 2011
12 2
 
4.
Ejaculating in the middle of the night to relax yourself and bring on sleep.
I was wide awake untill I slumberjacked
by Creamy G April 26, 2010
10 2
 
5.
The act of involuntarily masturbating in one's sleep.
Stuart's wife was delighted to find her husband slumberjacking in his hospital bed. Stuart was involved in a horrific traffic accident some months ago and has been in a coma since. And now, what initially disturbed her deeply in their honeymoon bed, gave her hope.
by Phoster Remingtin September 10, 2011
8 1
 
6.
To receive oral or manual stimulation while sleeping.
I was in the middle of a pleasant dream, when all of a sudden I awoke to find I was getting slumberjacked.
by Biggs9 June 08, 2011
6 3
 
7.
(verb) The act of masturbating right before you fall asleep.

The final "jack sesh" of the day to easy you into slumber

*note*

to jack, jacking, jack off, and the like are all slang for male masturbation
EX. 1

Friend 1: Dude, how many times have you jacked it today?

Friend 2: Three, not including my upcoming slumber-jack

EX. 2

Friend 1: I am so wired, I'll never fall asleep tonight

Friend 2: Bro, I have the perfect solution for you! Treat yourself to a slumber-jack, it never fails me
by Bilbro Baggins (of the shire) September 13, 2011
2 1