Wikipedia attempts to describe it better...
'Queer' is an umbrella term for sexual and gender minorities who are not heterosexual or not cisgender. Originally meaning "strange" or "peculiar", queer came to be used pejoratively against those with same-sex desires or relationships in the late 19th century. Beginning in the late 1980s, queer scholars and activists began to reclaim the word to establish community and assert an identity distinct from the gay identity. People who reject traditional gender identities and seek a broader and deliberately ambiguous alternative to the label LGBT may describe themselves as "queer".
*Cisgender (often abbreviated to simply cis) is a term for people whose gender identity matches the sex that they were assigned at birth. Cisgender may also be defined as those who have "a gender identity or perform a gender role society considers appropriate for one's sex".
In other words, a deviation from the binary 'male' or 'female' with arbitrary traits of gender identity, irrespective of their gender assignation at birth. This is not the same as transgender, which is more specifically someone living as the binary opposite of their birth gender assignation.
Wow, now I'm confused lol.