Looking on the internet deeply has found these results:

why not is the most popular phrase on the web.

yeah sure 1320,000 results on the web	why not 125,270,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
yeah sure. A polite way of say �I don't give a rat's ass about this�. Friend1: Hey, lets go to a movie or a play tonight. Friend2: yeah sure. by DeeplyLovesCoffee�... ... Turkish � Ukrainian � Vietnamese � Help translate! �\_(?)_/�. There aren't any definitions for yeah yeah sure sure whatever yet. Can you define it? Define it! what? oh, umm...yeah...sure. what you say when you werent listening to or dont understand or dont know how to answer the question asked OR when the�... When you're hanging out with someone you really look up to and they ask you if you want to go to a party, play it cool by saying �Yeah, sure,� instead of �Yes!	I don't see why not, George. So why not Frankie Wilde hummus? I don't see why not. At Capannina Beach why not? ... Give me one reason why not. ANGELO Traveling to the Dominican Republic: why not. I don't see why not.

yeah sure

1320,000 results on the web

why not

125,270,000,000 results on the web

More popular!

yeah sure. A polite way of say �I don't give a rat's ass about this�. Friend1: Hey, lets go to a movie or a play tonight. Friend2: yeah sure. by DeeplyLovesCoffee�...
... Turkish � Ukrainian � Vietnamese � Help translate! �\_(?)_/�. There aren't any definitions for yeah yeah sure sure whatever yet. Can you define it? Define it!
what? oh, umm...yeah...sure. what you say when you werent listening to or dont understand or dont know how to answer the question asked OR when the�...
When you're hanging out with someone you really look up to and they ask you if you want to go to a party, play it cool by saying �Yeah, sure,� instead of �Yes!