Kevin Hart recently appeared on the David Letterman show promoting the movie 'Grudge Match'. Kevin also decided to give Dave a nickname. It's Davey-O. In the clip you'll hear Kevin also talking about cursing out Sylvester Stallone while shooting the movie.

Apparently, not only did Kevin let it fly on the "Grudge Match" set with Sylvester Stallone and Robert DeNiro, but he also let it fly on the Letterman show assigning Davey-O a new nickname.

If you're planning on catching a movie this weekend, may we suggest 'Grudge Match'.

If you enjoy their personalities you'll love this clip from the show.