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10.
Perhaps one of the greatest of God's creations, but at the same time the worst. It all depends on the circumstances. When the body goes into REM sleep, capillaries go into hyper vasodilation, and thus the penis becomes goes in one of the most intense and hardest erections a man can experience.
TEACHER: Tommy!? You're late again! Care to explain!?
TOMMY: You want the truth?
TEACHER: Yes!
TOMMY: OK, here it goes. For the past few mornings, I've woken up with some gnarly morning wood, and to waste something is a sin; so, I took full advantage of the situation each time.

DAN: Dude, what's up? You sick or something?
JAKE: No, man. I slept naked last night, and slept in this morning to the point where my mom came into my room and threw the sheets off of me. I had massive morning wood, dude, and she saw it. AWKWARD!!!
by jmw0EightSe7en June 13, 2011
 
1.
A morning erection that is naturally caused as the brains enters the REM-deep sleep phase. At this stage, the body's skeletal muscle structure relaxes and causes hypervasodilation in the capillaries of the body, resulting in said erection.
After sleeping so soundly and having a great night's rest, it is no surprise to wake up with an erection.
by Dr.Pascalle December 02, 2004
 
2.
Your dicks way of saying "Hey, you've ignored me for 8 hours, now i'm going to make you piss all over your feet"
I got morning wood, and mom didn't see it, so she gave me a hug and got a suprise.
by Dirty-Dirty January 26, 2006
 
3.
the main reason that I miss the school bus in the morning.
I was taking a shower and got morning wood so I had to rub one out and missed the school bus
by mark March 29, 2004
 
4.
when a man wakes up with an erection
I dreamed about your mom last night and waked up with morningwood
by TOOOOOL May 26, 2005
 
5.
When a person (preferably a man) wakes up in the morning in an upside-down "T" position. Characterized by the largest, possibly most embarrasing erection ever to be witnessed. Also called "morning glory" and "pitching a tent." Ways of getting rid of morning wood include: counting to 100, visualizing your grandmother in a string bikini, and challenging youreslf to a friendly game of horseshoes (ringtoss if no horseshoes are readily available).
MOM: "Billy, wake up! Time to go to school."
BILLY: "God, mom, How many times have I told you to knock?!?"
MOM: "Goodness Billy, why did you pitch a tent inside your bed?"
BILLY: "I didn't mom. It's my morning wood. Now get out!!!"
by Don Andino February 01, 2006
 
6.
an erection that occurs when you wake up in the morning
I woke up with a morning wood today.
by Light Joker August 28, 2005
 
7.
When you get a NARB (no apparent reason boner) after waking up, usually caused by a full bladder pressing against the prostate.
- Today I woke up with a boner the size of the Washington fucking Memorial.
- lol.
by ytfk dot com November 16, 2004