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.

Whats the meaning of hook up with someone?

Hooking up is used to describe a sexual encounter (vaginal, anal, or oral sex) between two people who are not in a dating or serious relationship and do not expect anything further, their study says. Theres more risk than having sex when its planned.