热乎 is a colloquial adjective meaning 'pleasantly warm' (of food, objects, or weather) and also 'warm-hearted, affectionate' (of a person's manner). It is formed from 热 (rè, hot) plus the suffix 乎 (hū), and is used in spoken Chinese to describe something that is still warm or a person who is friendly and approachable. Unlike 热 (rè), which can mean 'hot' or 'feverish', 热乎 implies a comfortable, moderate warmth.