But my dick's on strike
So all that love shit is null and void,

from Eminem – So Much Better Lyrics on Rap Genius

Meaning

His dick is on strike, he refuses to love any woman. He says, that love shit is null and void, which are from programming terminology; Null means that love is nothing and void means that love doesn’t return anything. Em doesn’t trust women anymore and refuses to love so that he can’t get hurt again.

Also ties into the baseball theme when he says strike, referencing a pitch that is one or more of the following:

  1. Swung at and missed
  2. Not swung at, but in the strike zone as ruled by the umpire
  3. Hit into foul territory without being caught (except when there’s already 2 strikes)
  4. Bunted into foul territory with 2 previous strikes on the batter

To continue the baseball theme, his dick is on strike to mean, its choosing not to work in protest. To be “on strike” means:

a refusal to work organized by a body of employees as a form of protest, typically in an attempt to gain a concession or concessions from their employer.
“dockers voted for an all-out strike"
synonyms: industrial action, walkout, job action, stoppage

In 1994, the Major League Baseball Players Association famously went on strike.

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