The best way to say something is neat-o, awesome, or swell. The phrase "ripe" is very relaxed, never goes out of style, and people will never laugh at you for using it, very convenient for people like me who don't care about what's "in."
Mitchell: Hey man, i found a dog in the basement downstairs!
Oliver: Thats so ripe man!
Simeon: Thinking about doing some burnouts down the road.
Brendan: Sounds ripe man! Lets do this together.