I don't get "cruising".

I live in the middle of a city, near a lot of bars and clubs. Every weekend, those bars and clubs are full of people drinking, dancing, and listening to music. I get that. I do that.

What I don't get is why, every weekend, the city streets are clogged by drivers who circle the block like extras from the set of The Truman Show.  Literally hundreds of drivers (+crew) spend all night cruising (slowly and loudly), cat-calling and, singing off-key in my neighborhood.