Hooking up means having some sort of intercourse, whether its oral anal or vaginal. Having oral, anal, or vaginal intercourse, usually spur of the moment with a new partner. Hooking up means any sexual act with a partner of either gender.

Are you playing hooky?

When you play hooky, you take the day off from what youre supposed to be doing. The classic example of someone who plays hooky is a kid who skips school, or is truant. You can also play hooky from any obligation, simply by not showing up.