1. To have sex with a woman while wearing a clown costume.
2. A group of men, dressed up as clowns, arriving in a small car and running a train on one woman.
1. After a night of drinking, he would often end up clumping Ms. Sherman while eating a fried fish.
2. Yo, let's go clump that bitch.
In it's most severe connotation, clumping is relaxation to near incapacitation. However, clumping can be a moderate action of chilling but in a more relaxed state than simply "chill."
Bro you clumping way to hord out daritz right now.