Yea sure means you are lying or a suspicion about what’s someone is saying. Periodt
A Person: I have a bf and I really like him but I am talking to this other guy that I don’t like at all

Me:Yea Sure whatever
by Tiara or is it.... June 18, 2019
This is when someone tells you something that you really don't care about. OKsureuh huh
Sean,"I just got a new job making more money than you!"
John,"Yea, sure."
by beez217 October 3, 2015