To conspicuously show off how humble one is. To advertise that one doesn't have an ego, that one doesn't want or seek status or attention, doesn't care about fame/fortune, etc.
1. (adj)An environment so humid that it creates boob/breast/titty sweat.
2. (adj) The excessive presence of boob/breast/titty sweat resulting from a hot and humid environment.
3. Term is applicable to any male or female anatomical part.