The superhero (real name TChalla) doubles as the king of a fictional African country named Wakanda.
Because of this, Boseman developed an accent indicative of the region.
As he said on ThursdaysJimmy Kimmel Live!, Boseman tested the accent out before hitting the big stage.

Credit: ABC
You know how comedians will do a small comedy club before you do the big show?
Kimmel pointed out that although theres no Wakanda in real-life Africa, there is one in Illinois near Wisconsin.
The host quipped that he shouldve just tried a Wisconsin accent.
That wasnt even the last strange premonition related to the role, Boseman said.
Wow, you might be a real superhero, Kimmel said.
This is how it happens.
Watch the clip above.Captain America: Civil Warhits theaters on May 6.