A less boring way of saying “Straight” the “Oppo” stands for opposite. So Opposexual is the act of like the opposite sex
What’s you sexuality?
Oh! I’m opposexual
Someone who is attracted to the opposite sex.
Emily: “I’m opposexual. I only like men.”
Josh: “Wouldn’t that make you straight?”
Emily; “OMG STOP YOU'RE SO HOMOPHOBIC”