adj. - When you have little time to do something; close; difficult.
Not to be confused with what you do to with your ass cheeks to prevent poop from involuntarily exiting.
"We have to be there in 5 minutes, it's gonna be pretty clench."
"I have all day surfing lessons for the next few weeks; my schedule is pretty clench right now."
"The exam had so much on it I barely finished. It was pretty clench."
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