“Blue Meanie” is a name applied to at least two different mushrooms. One is a strain of Psilocybe cubensis. The other is the species Panaeolus cyanescens which is consider the “real” Blue Meanie. Both are psychoactive and sometimes used recreationally or medicinally, but it’s important not to confuse the two (though be careful, as some writers do mix them up). For one thing, Panaeolus cyanescens is dramatically more potent and therefor requires different dosing guidelines.