When someone mentions first base, second base, third base, or a home run, they're likely referring to the bases of dating, sex, and relationships.

First base is kissing, making out, open-mouth kissing (a.k.a french kissing), and closed-mouth kissing. Second base is touching above the waist. Third base is stimulating anywhere below the waist.

As the writer puts it, “The best way to remember them is, of course, the four ‘F’s. French, Feel, Finger, Fuck.” Know Your Meme agrees: third base is fingering or hand jobs.