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1.
Pre-morning wood.
While still sleeping girlfriend notices you have an erection.
So the other night I unknowingly had sex with my girlfiend with my slumber lumber.
by kmichener June 17, 2011
 
2.
alternate term for "morning wood"
The maid was aghast when she found the sleeping lumberjack, snoring, his slumber lumber proudly in view.
by Dan Farman May 09, 2004
 
3.
Slumber lumber is another euphemism for waking up with an erection- otherwise known as 'morning wood'.
"I woke up with some gnarly slumber lumber and I asked if I could take it to her sawmill."
by kdutremble December 09, 2009
 
4.
A more sophisticated version of morning wood. Usually when you are fully asleep, and the blood can add extra power.
Sarah: After Steve fell asleep, he got the most AMAZING slumber lumber last night.
Kiki: Wow, I wish my man, Jamal had that.

Sarah: True Story
by TheTrueStoryGuy May 08, 2014