Definition
When you and your girl shag under a blanket without kicking your best mate out of the room.
Example Usage
"Hey, what's the problem mate?"
"Nothing, I just witnessed a physics lesson over the weekend"
"Ooh..."
Origin
Urban Dictionary
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See “Physics lesson” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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pebcak
Problem Exists Between Chair and Keyboard...