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 1, 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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The act of dozing off while masturbating, or jerking off while asleep.
“My boyfriend’s great at slumberjacking, he really knows how to handle wood while he saws logs.”
by PostModernValkyrie May 10, 2018
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The act of masturbating onto a sleeping person.
"She drank too much and passed out early so I slumberjacked her."
by The Boogieman September 15, 2012
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The event in which all guest at a slumber party are male. Usually when the significant other is out of town and the guys just wann have fun but are at the age where partying all night is just too much.
We were going to go to a stripclub but ended up staying in and having a slumberjack party with the guys. Wine, cigars, football, and blanket forts.
by CherylDactyl October 26, 2015
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The act of waking up with morning wood, and trying to think of a desturbing image to effectively "chop down the morning wood.
I woke up this morning with maaaad wood, and I slumberjacked away. TIMBERRRR!!!
by emperorshin January 11, 2014
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