ANSWER:
Armpits sweat can smell like onions when a person have a hyyperhidrosis.
It is an unormal condition that the armpits smell to much because of a sweating problem.
Armpits can smell like onions also because of a bad hygiene...
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Your armpits sweat out some of the nasty toxins in your body. The sweat itself is oderless, the bacteria that feeds on it is the nasty smell. Your body needs to sweat. Wiping your armpits with a wet towel is the way to go, it is advised you dont use deoderant on days you dont go out.
Body odor is determined by penis size or breast size.if you have onion smelling body odor you have a relatively small penis or breasts sorry bro