A slang term for a woman's clitoris.
The motion of moving your finger over a woman's clitoris as you would do with a trackball found on a Blackberry mobile device.
Mike: Whats so exciting about that?
Josh: Mine still has a scroll!
Mike: Lucky, I don't take care of my Trackball, so it often fall's out.
2. The plural for a type of computer mouse that involves a stationary ball that rotates to move the cursor.
1b. "John didn't want to have sex; I thought it was because he was cheating on me, but it turns out he just had a bad case of trackballs after freeballing it at the track meet."
2. "I prefer trackballs to typical mice because I'm a loser that plays World of Warcraft 24/7."