Oboing
OR BEST OFFER is like saying, 'This is the best deal I can give you, and if you don't take it, I'll punch you.' It's for classified ads, and you use it to look cool.
OR BEST OFFER: 5 bucks for this used phone. If you don't take it, I'll steal your lunch money.
OR BEST OFFER: This bike is free. Don't argue with me, or I'll tell your mom.
OR BEST OFFER: I'll sell you this dog for 10 bucks. If you say no, I'll eat your homework.