I have no idea what a "cornball brother" is, but when an idiot like Rob Parker speaks, you can expect to hear a few terms that probably don't exist.

Cornball Brother
a. An African American male who chooses not to follow the stereotype. This includes, but is not limited to, being educated, well spoken, a role model, a leader, selfless, an upstanding member of the community and above all - humble.

b. life choices include marrying white women, being republican, and not being "down with the cause".

c. a rare breed of African American males who should be praised, not chastised by their own race.

d. a term where MLK would be rolling over his grave for

1. Dat RG3 got himself a becky. He a cornball brother (brotha) - na'mean?

2. Dat cornball brother (bruva) talk like he white

Urban Dictionary: cornball brother