When you're fucking a fat bitch and her pussy starts to make a creamy white sauce. Primarily when you're having sex with a white woman.
Bob: My wife and I are gonna go home and make some slam chowder.
Earl: Bruh, nasty.
When you and all the boys take turns cumming in a chick and she pussy farts it into a bowl letting it sit in the sunlight to bake. Strongly resembling chunky clam chowder.
All my boys at Lavergne PD made a sick batch of Teneskeet Slam Chowder.
Slam Chowder is the special sauce the male employees add to the cup of nasty customers.
That woman was rude, I'm going to give her the slam chowder