tap-tap
 n.— «She leaves the house at 4 a.m. to catch the “tap-tap,” one of the privately-owned vans, buses, and trucks that serve as Haiti’s equivalent of public transportation. The always crowded tap-taps—coined for the two-tap system for signaling boarding and exiting—are painted in carnival colors and emblazoned with hopeful messages such as “God is merciful” and “Love is Eternal.”» —“Faith abounds” by Mary McCarty in Leogane, Haiti Dayton Daily News (Ohio) Aug. 4, 2004. (source: Double-Tongued Dictionary)