A person (usually a male) who usually does kumon, has no taste in music, has a lot of pimples, is usually narcissistic.
A biglang-awa will always say he/she is optimistic.
Biglang-awa can also be a male full of himself.
Guy:Dude, you're such a biglang-awa.
Guy 2: Shut up! I'm cool.
Guy 3: No, you're full of yourself!