To accelerate through first base (french kissing), onto second base ("heavy petting") to third base (oral sex) and finally coming around to home plate (sexual intercourse).

To engage in the act of sexual intersourse, can follow the other bases but doen't have to

When you skip to the fourth base with someone, or complete all four in quick succession.

Home Run: THAT BALL IS LONG GONE JUST LIKE YOUR EX-GIRLFRIEND WHO SHALL NEVER RETURN

To fuck that bitch.

To "kick it" and/or fuck.

When a male masturbates with his laptop on his stomach and when at orgasm, ejaculates semen over the laptop screen.