Definition of queer:
(n) :
a
homosexual; a person who
appears homosexual, or a person who has homosexual
qualities; a person of atypical sexuality or sexual identity
(adj) :
(somewhat old-fashioned) Weird, odd or different; (somewhat old-fashioned) Slightly unwell (mainly in to feel queer)
(v) :
to render an endeavor or agreement ineffective or null; to reevaluate or reinterpret a work with an eye to sexual orientation and/or gender, as by applying queer theory