Gagging is hardcore porn where a guy fucks a girl in her mouth. It’s not an ordinary blowjob, but one where the guy pushes his cock into the girl’s mouth like a pussy. The girl usually gags with watery eyes and sometimes even vomits. The man wants to shoot his cum deep down her throat. So that the woman has to swallow his sperm. It is the most derogatory form of fellatio for a woman. But super exciting for the man.