It means you don't believe someone. You either think they are embellishing their abilities to look better or they are downright liars.
You're a rocket scientist yet working at McD's. I'm claiming shine.
Your resume says you have 10 degrees from Harvard and 4 from Oxford. I'm claiming shine.
He says he earns a million dollars a year and only lives in Compton to be close to his family. I'm claiming shine.
When you typo the word 'pto' (paid time off) in your e-mail to your boss or co-worker, and they think you're leaving your day job, but instead you are only going on vacation for a couple of weeks.
Fred: Hey, I'm starting pro tomorrow. I'll see you later.
Fred's Boss: OK, good luck with that.
<two weeks later>
Fred: Hey, why doesn't my ID badge let me in the building anymore?
Fred's Boss: So I guess that basketball career didn't work out for you?
Fred: Huh?
The point where you are so tired in the middle of night that you go tell your friends. I'm gonna go watch some food. Then you should realize what you said unless your really tired. (Credit to Anthony Calderon he said it first)
Hey brb I'm gonna gowatch some food. Wait. What? (laughs)