When someone who, in response to a question wants to say yes or yeah but cannot decide, chooses to say Yeas, thus becoming either the largest or 2nd largest douchebag nearby (Depending on the emphasis level of "Yeas" used).
Friend: Hey do you want to order a plate of nachos?
You: Um... Yeas!
(Now Ex-Friend): Alright then... waiter is over there, see you at work tomorrow