" sell up "

 [ "Up-sell" ]

1: A method used by your friendly, self-motivated drug-dealer to try and squeeze you for more money.

  * e.g.,  ... When your dealer bestows upon you, out of the goodness of his heart, a free bag of better/more expensive product that makes what you usually get from him now seem like a bag of crappy-ass shit. Of course he would deny trying to Up-Sell, but is hoping to turn your usual $100 order into a $200 order, having shown you what you are missing. He might also step up the game by making sure your $100 bag now goes down in quality each time you buy, just enough to be noticed by you but not seem obviously intentional by him. 

 [ "up-sell defense" ]

1: The act of constantly saying "no" or "no, thank you" or "I don't need that" to sales people who persistently try to up-sell you additional services or add-ons during a point of sale or negotiation of service(s).

  * e.g.,  ... So after 10 mins of playing up-sell defense I am totally exhausted. Mind you, I just want a car wash. If I wanted to get up sold and haggled out, I would have gone to the swap meet for some churros and butterfly knifes. How many times to I have to say no, I don't want that super wax?