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3.
An appreciation of a very well performed action.

An extension of the classic "That was textbook", used only in situations where the action has been performed really, really well.
"That handbrake turn was sextbook"

"I very much appreciated that maneuvere on many levels and felt i needed to advertise my appreciation"
by King Bongo Berious September 01, 2005
 
1.
A textbook for a human sexuality course.
I can't believe I just fell asleep reading my sextbook. You'd think it'd be more interesting...
by lady_so_divine July 14, 2011
 
2.
Vandalizing textbooks by drawing dirty pictures
Student 1:what are you doing to that textbook?
Student 2:drawing Ms. Van Dyke giving head
Student 1:oohh your making a sextbook
Student 2: all day
by Joey Phatoney May 31, 2011