Top Definition
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

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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

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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

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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

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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

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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

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A Slumber-Jack refers to the combination of masturbation & napping. Masturbation is used as a natural sleep aid.
I think the only cure for this hangover is a good Slumber-Jack.
by Midnight Stroker July 24, 2008

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The Urban Dictionary T-Shirt

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