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A giant smelly blob in your hair that looks like a booger and smells like you forgot to shower and also forgot you had hair. It happens when you slather on way too much product and then go to sleep like a confused donkey.
My cousin’s hair booger was so big, it looked like a squirrel had died in his hair.
I had a hair booger so bad, my dog ran away from me.
My hair booger was so gross, my teacher made me wash my hair in the sink.