You won’t even listen so fuck it, I’m tryna stop you from breathing
I put both hands on your throat, I sit on top of you squeezing

from Eminem – Space Bound Lyrics on Rap Genius

Meaning

The goal of this song was to validate the angry emotions heard in “Kim” a song on The Marshal Mathers LP, and this line does exactly that

Kim cheats on Eminem after he makes himself vulnerable (see earlier in the verse), which got him so angry that he wanted to kill her (choke her, to be exact)

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