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To pull a boner is to mess up so bad it makes your face turn red and your brain turn to mush. It’s like when you spill your entire lunch on the floor and then trip over it.
I pulled a boner and told my mom I was going to be a vampire for the rest of my life.
I pulled a boner and said my teacher was a chicken.
I pulled a boner and tried to sneak out of school by wearing my pajamas.