Gender fluid – Is gender identity which is a dynamic mix of boy & girl. A person who is gender fluid may always feel like a mix of the two traditional genders, but may feel more boy some days & more girl other days. This has nothing to do with which set of genitalia one has, nor their sexual orientation.
Gender queer/Non binary – A person who identifies as neither male nor female. An identity that falls anywhere between man/boy/male & woman/girl/female on the spectrum of gender identities.
Gut flopping – Where a large bellied individual raises his or her stomach & allows it to drop upon his or her sexual partner in a way that creates a *smack* sound. This is an act performed for sexual pleasure.