third base:

Americanism for the female genitalia ; based on a baseball analogy. To get-to-third-base , petting below the waist, in distinction to first-base , kissing, second-base , petting above the waist; third base , and home-base or home-run , meaning to go-all-the-way to sexual-intercourse . See vagina for synonyms.

Link to this page:

Word Browser