Used to express extreme pleasure or acknowledgement.
Person 2: "DE-CENT!"
Sis: It was decent.
Bro: How was the food at that restaurant?
Bro: How's that book you're reading?
Sis: Uhhhhh..it's decent.
Bro: Get a thesaurus, please.
Sis: Hey, that's a decent idea. I bet there are some decent alternatives to "decent."