A Seconds Second Meaning

(I am with my friend and her family for the weekend. We are getting ready to go out for dinner and my friend is taking a while primping. Her sister gets impatient.)

Sister: “Come on, I’m starving!”

Friend: “I’m almost ready, just gimmie a sec.”

Sister: “I’ve given you enough secs already!”

(She hears what she has just said out loud, and turns very red.)