Definition
A 'queer duck' is a similar idiom to 'queer bird,' referring to someone who is odd, eccentric, or peculiar. It's a way of describing someone whose behavior or characteristics deviate from the norm. Like 'queer bird', the term carries a sense of mild judgment but can also be used humorously. Given changes in social acceptance, the term can be offensive to some. An equivalent might be 'oddball'.