Lips so big that they block the entrance of most couscous into the oral cavity. Good entertainment for friends at the lunch table.
You're never actually going to eat any of that couscous with them nagger lips getting in the way.
Noun: Lips with a mind of their own. If every caught on film known to cuase momentary blankness on screen of viewing machine. Same with photograph.
"He's got those nagger lips"