What is a person with a low laugh?

When we were studying, we had a good time with people in different dormitories. We have a joke that is very low, that is to say, we will laugh. Then one weekend, my roommate and I went out for a haircut and cut it short. He told the stylist what to do and finally got a jet head. When I went back at night, the classmate with a low laugh was still in his dormitory. After coming back, we went back to the dormitory. Then the classmate saw it and told it to the classmate with a low joke. As a result, there are almost seven dormitories between us. When he heard about it, he laughed from his dormitory to our dormitory and heard his laughter from a distance. When no one arrived, the laughter came first.