This is a phrase that's used during negotiations.
It
basically means that what you'
re asking for would make your share too
large.
aka asking for 2 nickels per 1 dime
person 1: "So what percentage would I be taking?"
person 2: "I'd give you seven, we could
shake and make it happen"
person 1: "I wasn't born this morning, eighteen would be just
fine"
person 2: "Why not just go ahead and ask for nickels on the dime?"
person 1: "Fifteen"
person 2: "I'd do eight"
person 1: "twelve"
person 2: "seven"
person 1: "ugh
fine, 10?"
person 2: "nine it is then"
person 1: "...deal"