The act of staring blankly at a screen in the dark for a long period of time. Tends to avoid human contact at all costs.
A: Oscar's an actual tennis ball head.
B: He's just sitting there in the dark, doing nothing.
by ExquisiteMouse April 27, 2021
A thin, fuzzy layer of short hair on a black woman's head. This hair is usually about 2-5 cm in length. This makes their hair resemble a tennis ball.
-You see that black lady's haircut?

-HA! She's got a tennis ball head!
by JIMINY JOE April 8, 2011