b.o.

n. smell that is unique to a person's body, smell of perspiration

Bromhidrosis or body odor (also called bromidrosis, osmidrosis and ozochrotia) is the smell of bacteria growing on the body. These bacteria multiply considerably in the presence of sweat, but sweat itself is almost totally odourless. Body odor is associated with the hair, feet, groin (upper medial thigh), anus, skin in general, armpits, genitals, pubic hair, and mouth.
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Noun
1. malodorousness resulting from a failure to bathe
(synonym) body odor, body odour
(hypernym) malodorousness, stinkiness, foulness, rankness

NAD