When you dream of noticing someone’s or yours armpit it symbolizes your relationships with others and the way you are socializing. You are the person who knows how to present yourself to others, how to act while talking with specific person. If you smell your armpit in the dream it means that you are trying to replace some of your features assuming that covering up the circumstances. This dream represents you as looking for approval from those around you.
Read more about dreaming of Armpit in other dream meanings interpretations.