Fuckin' Lame Ass Shit. An expression of disgust, distaste, disappointment, depression, or anger. It was formed in late April 2008 and its usage in popular culture has slowly been growing since then. The origin of the word was in Central California in San Luis Obispo County. There are many possible uses for this word and it could apply to many different situations.
Scenario: You and your poor friends finally save up enough money to buy an ice cream cone. In every group of friends there is always one person who screws everything up. And this time, that individual drops the ice cream cone.
Dude that was FLAS. Way to be FLAS. You are FLAS man... Dude....really? Thanks man. Thanks.