Cool bean refers to someone or something that is interest you.
Only used by the coolest of cool kids. "cool beans" means something was TOTALLY EPIC.
human 1:my mom and dad fucked my hamster
human 2:cool beans
a thing scene kids say to show they're capable of using sarcasm. unfortunately, it fails when they use it one hundred times a day. it is also popular for them to use on twitter.
Person 1: Bro I lost your ADTR shirt...
Person 2: Seriously man? Cool pissed.
@ihaveatwittercauseimscene: Forgot I had a test today... #coolpissed
A substitute for the phrase "cool beans" when it grows old due to over use, and people want something else to say that reminds them of how cool they felt when they first started saying "cool beans".
Hey when will you get here?" "In 5 minutes" "Cool buns"