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When a guy gets a supermassive erection during class and it bumps against the bottom of his desk, making a loud noise.
Girls will have no idea what the fuck just happened but guys will pick up on it relatively fast.
Teacher: "Good morning class, today we will be watching a documentary about slavery in colonial America."

(BUMP)

Teacher: "Alright, who's the Ukrainian drummer boy?"
via giphy
by Professor Kukui January 08, 2018
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