언능 is a dialect of 얼른 which means "quickly,right now" 챙겨 먹어요 is composed of 챙기(다)+어+먹(다)+어+요. 챙기다 means "take,get,do not skip" 먹다 means "eat" 챙겨 먹다 means "do not skip meals; eat meals regulary" 언능 챙겨먹어요 means Don't skip meals and eat them quickly right now.