"Violently cumming"

My best friend told me that one time he got home from school, thinking he beat everyone home, and decided it was a good time to log into his favorite porn site to jerk off. He said he was too busy "violently cumming" to hear when his dad walked into the room. His dad cleared his throat and my friend made eye contact with him, penis in hand. My best friend lowered his head quietly, logged off the porn site, and then shut down the computer. Once the screen went black, his dad left.