TʜᴇʀᴀᴘʏGⒶʀʏ⁽ᵗʰᵉʸ‘ᵗʰᵉᵐ⁾

“Bars” = the long rectangular 2 mg‑style Xanax tablets

“Pressed” = pills made with a pill press, usually by dealers, often containing different drugs, and sometimes debossed with an insignia

If the pills aren’t branded with the dealer’s mark, it’s odd that they would know it’s pressed at all, but they may think “pressed” = purchased without a prescription

I think the point though is that, one way or another, they ended up with noticeably fake xanax but are taking it anyway despite the awareness that it may contain random substances