look up any word, like hipster:
 
1.
The word 'Yayeah' means either that you think something's awesome or you're just R E A L L Y ! excited about something. For some awesome examples, check the examples.
He: "So, how was your day?"
She: "Not too bad, wanna have sex?"
He: "YAYEAH!"

- another example -

She: "So, how was your day?"
He: "Not too bad, wanna have sex?"
She: "No."
He: "Wanna have some shoes?"
She: "YAYEAH!"
by I'm Awesome nr. 2 August 10, 2011