A way to silence someone by agreeing to what they just said. Usually said with a strong scouse accent for emphasis. The longer the phrase can be extended with additional words, the better.
Steve: hey have you thought about becoming a vegan?
Ted: yeah mate yeah, okay mate very good that yeah
The act of responding to a prom invite
"Do you want to come to prom with me?"
"YEAH YEAH YEAH YEAH YEAH"
What you sarcastically grumble when everyone in a group seems to wanna get all cozy for no apparent reason.
(Spoken while dutifully cooperating in a huge "crowd embrace" of party-goers just to be polite and agreeable, but not really understanding why everyone wants to get all cozy) "Yeah, yeah, yeah --- arms around... aren't we all huggy-cuddly-snuggly LOVEY-DOVEY today!!"