Pong/pɑːŋ/ Definition 1 of 3Pro Tip 1/3Negative Connotation Pong usually describes an off-putting smell, suggesting a negative reaction. After the workout, my gym clothes had a distinct pong. Pro Tip 2/3Intensity of Smell Use 'pong' when the smell is strong enough to notice immediately upon entering an area. The entire hallway had a pong of wet paint. Pro Tip 3/3Informal Use 'Pong' is quite casual, so it's not appropriate for formal writing or discussions. Ah, what's that pong? Did something rot in the fridge?