When you're in a narrow-ish passageway and one of the two people trying to pass sticks their butt out so freaking far that the other person can't get past without making for one extremely awkward situation.
I was trying to walk down the hallway when he started butt blocking me!
by Disneydork323 January 29, 2011
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A square turd. A rectangular prism of a hearty black turd. It consists of a very rough texture. It is usually painful and sometines stringy. It pops out slow and hurts for a while afterwords.

You may also be considered a butt block if you are an asshole with a square jaw, face, or if you have a square-like personality.
"After I squeezed out that massive butt block, I had to show my mom so she could take me to the doctor." "I obtained some but damage." "My dog, jerry, left a quality butt block on my nieghbors lawn."
by Madman464 February 19, 2011
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