The universal definition is "to get something done," but it can be stretched to mean "to close the deal," "to sell," etc. The opposite of procrastinating.
Person 1: I'm almost done with this report! I'm so close to cinching the peet!
Person 2: Yeah, dude, cinch the peet!
Person 2: Yeah, dude, cinch the peet!
by The Best Bean April 23, 2015