Entry 1 sense Webster, 1913 Eggnog /ĕg'-nôgˌ/ · Egg·nog · IPA /ˈɛɡ.nɑɡ/ 01 n. A drink consisting of eggs beaten up with sugar, milk, and (usually) wine or spirits. 1. A drink consisting of eggs beaten up with sugar, milk, and (usually) wine or spirits.