2. If Person A hooks up with Person B, and Person B hooks up with person C, person A has hooked up with person C. This property is hated by most high school/college age persons.
3. Definition 2, as a verb. To hook up with someone by the transitive property.
2. I got with Dana yesterday, she got with Joe the day before... Now I've hooked up with Joe by the transitive property... damn.
3. We all unknowingly pulled a massive transitive property by hooking up with Julie.
A sucks B's dick, then later makes out with C. therefore, C has had B's dick in its mouth
Yay for the transitive property!