Meaning: This means that the chocolate is becoming liquid as it is inside my mouth, which is at a warm temperature.
Choice of Words: Chocolate is a sweet food made from cocoa beans. Melt is a verb that means to change from a solid to a liquid. Warm is an adjective that describes something having a moderate temperature. Mouth is the opening in the face through which food is taken. My is a possessive pronoun that shows something belongs to the speaker.