No more secs!
Its sounds like no more sex. But really it means no more seconds. If someone like a child is doing something and someone else like a parent or teacher tells them not to, and then the child says "one sec", and then if the child say that a few times the parent or teacher will usually end up saying "No more secs!".
Teacher: "C'mon Billy, you gotta hurry up!"
Billy: "Just one sec"
-2 mins later-
Teacher: "Billy you have to come now!"
Billy: "Okay Okay, just one sec"
-3 mins later-
Teacher: "Billy im not going to tell you again!"
Billy: "Alright, on sec"
Teacher: "Billy, No More Secs!"
.*class laughs*.
Billy: "Just one sec"
-2 mins later-
Teacher: "Billy you have to come now!"
Billy: "Okay Okay, just one sec"
-3 mins later-
Teacher: "Billy im not going to tell you again!"
Billy: "Alright, on sec"
Teacher: "Billy, No More Secs!"
.*class laughs*.