Not to be confused with what you do to with your ass cheeks to prevent poop from involuntarily exiting.
"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."
guy 2: yeah, dude, I clenched these two hot roommates last night. They had ass for dayzzz.
guy: damn. sounds wild
(Verb meaning death, died, etc.) Have you ever wonder why Kenny clenches all the time?