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1.
1. The awkward moment when your male teacher has an erection and is standing in front of the class. He might try to hide it as well.
2. When a student sees an extremely attractive teacher and gets an erection.
"Dude, this is awkward, Professor Reid has a teacherection."

"Man, Mrs. Issenman is really giving me a teacherection
by Teamilk June 26, 2011