Definitions for odd man out
Random House Webster's College Dictionary
odd′ man` out′(n.)
a way of selecting or eliminating a person from a group, esp. in a game, as by tossing coins.
the person so selected or eliminated.
Ref: outsider (def. 1). 1
Origin of odd man out:
kook, odd fellow, odd fish, queer bird, queer duck, odd man out(noun)
someone regarded as eccentric or crazy and standing out from a group