The act of smoking marijuana. So much marijuana is smoked that the area resembles an outdoor bog. A foggy bog.
Example 1: OH, man, I'm so burnt out. We fogged up last night; I ate a Hot Pocket straight out of the freezer.
Example 2: Wanna fog up after class? We can watch my cats play in my backyard.
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To have sex in the car.
Hey babe, let's fog up the windows tonight!
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When your brain is all foggy and you have a hard time separating the concrete & abstract.
Side-note: Fogged up is also how Danish people pronounce "fucked up".
As Alice came to her senses her head was a bit fogged up from the accident, it felt as though she was still in wonderland, but had a hard time discerning what was real.
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