Waarom zingt Springsteen in Glory Days over ‘that speedball’?

“I had a friend was a big baseball player / back in high school / He could throw that speedball by you / Make you look like a fool boy.” Huh? Wat? ‘Speedball’?
“I had a friend was a big baseball player / back in high school / He could throw that speedball by you / Make you look like a fool boy.” Huh? Wat? ‘Speedball’?