took their head off
1) a big score in sales. 2) a profit margin collected in a transaction that is disproportionately large relative to the actual cost of the product or service.
Example:
"Gentlemen,...drinks are on Anthony tonight because once again he took their head off!",(roar in the office),"he set a new record,...15 pounds baby!!!"
"Gentlemen,...drinks are on Anthony tonight because once again he took their head off!",(roar in the office),"he set a new record,...15 pounds baby!!!"