Feelin myself, I don't even need an X pill

from Jay-Z (Ft. Swizz Beatz) – On To The Next One Lyrics on Rap Genius

Jay is admiring his own accomplishments (“feeling himself”), even without help from an Ectasy pill, which makes the user horny and thus prone to literally feeling him or herself

He’s probably referring to Mac Dre, who is known for his song “Feeling Myself” and for “thizzin”

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