a man's moustache having long, curved ends that resemble the handlebars of a bicycle.
Origin of handlebar moustache
First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for handlebar moustache
/ (ˈhændəlˌbɑː) /
a bushy extended moustache with curled ends that resembles handlebars
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012