hum·mer I. \ˈhəmə(r)\noun (-s) Etymology:hum (I) + -er (n. suffix) 1.: one that hums; specifically: hummingbird 2.: humdinger < the early pace was certainly a hummer — G.F.T.Ryall > • - on the hummer II. \ˈhəmə(r), ˈhu̇m-\verb Etymology: freq. of hum (I) dialect Britain: murmur, mumble