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The act of slapping ones friend across the face with a hand that recently resided upon your sack and taint. Best performed after a night of dancing and drinking. Caution, execution of a successful fast ball will require a retreat with due haste as the recipient of the fast ball WILL retaliate with extreme violence. Best executed whilst already running from your victim.
Person 1: I can't believe you fast balled Eddie! Didn't you remember he's our ride home?

Person 2: iJust keep running/i
fast ball by Jamazz January 30, 2004
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Kentucky Fast Ball 

When you cum into your hand and throw it at your sister
Dude last night I pulled a Kentucky Fast Ball on my sister !
Kentucky Fast Ball by RiasBloodRose September 6, 2016

Cheetah Balls Fast

Fast. Lightning fast. The fastest thing hanging off of the fastest thing on four legs. Created by The Oatmeal web comic under the Winter 2010 State of the Web.
Cheetah Balls Fast by ScurvyJake January 25, 2011

The Four Seam Fastball 

The act of using four of one's fingers to administer a handjob. The hand is not in the normal jacking off position, but rather the giver of the handjob comes from above and wraps all four fingers around the penis of the recipient. The position and movement of the fingers looks somewhat simliar to the movement of a jellyfish's tentacles, a lobster's claws, or how you would hold a baseball when pitching a four seam fastball. Invented by Elise, made popular by Muffin and Wills.
Elise gave Jack the four seam fastball, and Jack had to correct and show her the real way to do it.

Jellyfish Fastball 

This move is done after engaging in doggystyle secks. The man ejaculates into the woman's vagina. He then holds his hand like a cup underneath the semen (Jellyfish) filled vagina. With his other hand he grabs the woman's side and begins to tickle her. If done correctly it will cause a muscle contraction that forces the semen from the vagina into the cupped hand. When the woman turns to look back to see what is going on, that is when the male siezes the opportunity and hits her right in between the eyes with a Jellyfish Fastball.
That bitch was so pissed when I hit her with a sidearm Jellyfish Fastball!
Jellyfish Fastball by Hoostin10 September 20, 2011

Reagan Era Fastball 

A fastball in the mid-80s.

In reference to Ronald Reagan's presidential term from 1981 - 1989.
A Reagan era fastball for strike two. That's mid-eighties.

Suicidal Semen Fastball

Post intercourse, the man ejaculates into his hand, then winds up the Suicidal Semen Fastball firing it at his partner as fast and hard as he can, flinging the semen all across his partner's body.
" My boyfriend launched his Suicidal Semen Fastball at me, plastering semen all across my face. There were no survivors."