Remember that, with song lyrics, writers say things that we would not really say in conversation. However, here is the meaning, in this song:
"breathe the pressure" = feel intimidated by me; feel the adrenaline rush as you prepare to compete with me
"addict insane" was part of a longer line...
"Psycho-somatic addict insane":
"psycho-somatic" is a psychology term that means you feel something in your body that has no physical cause, but only a psychological cause. For instance, I may complain of stomach pain, but the doctor finds no medical cause. They, in talking with me, he discovers that I am worried about losing my job. The cause of my stomach pain is stress and worry. It is not an ulcer, etc. So this pain is psycho-somatic.
In the line by Prodigy, the songwriter is saying that other people will become addicted to the "rush" they feel around him, even though there is no physical cause for the addiction (drugs, alcohol, cutting, etc.). He will make them a "psycho-somatic addict". OR, they might even go "insane", because of the adrenaline and competition with him.
Because there is no context, the writer may also mean that HE HIMSELF is addicted to competition, or that he is insane ("I'm crazy! Watch out! I'll do anything to win!").
And, as songwriters often do, he may have meant people to think BOTH of these. Really, he chose these words because of their sound value; "somatic" and "addict" nearly rhyme, so this makes a hard-hitting rhyme for the song. And "insane" is an approximate rhyme to "game", so it works for the same reason.
You may also be interested in the English idiom "to play mind games": "to manipulate and confuse people for the purpose of amusement or self gain." This is the "game" in Prodigy's lyrics.