Barry saying "Hi!" with his Barthowheel font.
Barthowheel is a font created and edited by Jayvee D. Enaguas (aka Grand Chaos), used extensively by Barry in his annotations (text in yellow with a heavy black outline) on Game Grumps videos since late 2013, replacing Chapparal Pro (Bold).
It is based off the cartoon titling font from the 1964 movie "Bartholomew Versus the Wheel".