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!!!"