What is "hullabahoos"

The Hullabahoos are a student-run, all-male a cappella group at the University of Virginia in Charlottesville. The group was founded in 1987 by Halsted Sullivan and recorded its 19th studio album in 2014. They have performed at the 2004 Republican National Convention, Washington Nationals baseball games, Good Morning America, the Philippines, weddings, and private parties. Other performance requests have included invitations from the White House, the Kennedy Center, and NBC's The Today Show.