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A jacking block is when something or someone stops you from getting your rocks off, and it happens in three gross ways. Your dad won’t stop yelling at the computer, your brain won’t picture a hot chick, or someone walks in right when you’re about to blow your load.
My dad won’t stop playing Fortnite, so I can’t watch my porn.
I tried to jack off, but I couldn’t picture anything except my math test.
My brother walked in while I was about to cum, and I had to fake a sneeze.