Oakland clamshell
An Oakland clamshell is when you take a big black dildo, stick it on a bulldozer, and run it over your fat black friend’s butt until she squirts like a fountain.
My uncle ran over my cousin’s butt with the dildozer and she blasted cereal all over the street.
The local fat black woman did the Oakland clamshell and made the whole block smell like Frosted Flakes.
I saw a man do the Oakland clamshell on his wife and she screamed like a banshee.