Clags

A nickname for genital herpes.
Can be said as "clags" or "the clag"

We've got clags!

Jon: "Hey Tom, did Mary give you clags when you banged that one time?"
Tom: "Did Mary give me what?"
Jon: " You know, the clag? Herpes man."
Tom: "Why do they call it the clag?"
Jon: "Because it sticks with you the rest of your life."
Tom: "I guess I've got clags then"