Like drunk dialing, drug-texting is the act of texting someone while under the influence of any drugs, saying things you wouldn't normally say. When you drug-text, you are bound to make a complete fool out of yourself.
"I just got a text from my girlfriend telling me she hates me, I hope she's only drug-texting again."
"Today, I made a complete fool out of myself when I drug-texted Dillon. FML"