What is "handlebar moustaches"

Usage examples of "handlebar moustaches".

Both Al and Mike had grown impressive handlebar moustaches in imitation of their coach and a few of the other athletes.

And nobody in Milagro had ever been even one-half as surprised as was Snuffy when he panted over the gorge rim to discover, not a sly, conniving villain with handlebar moustaches and shifty eyes who'd attempted to end his life, but rather the old man, Amarante Cordova, looking like a thing that had just gone sixty-three rounds with seven bald eagles, staggering hi zigzagging circles, gasping and bubbling out ding-y sounds, with nobody else around.