peevee is short slang name for a stimulant drug MDPV, aka "monkey dust", "double penetrator", "ivory wave".
It's notorious for causing extreme paranoia and psychoses along with horniness and euphoria. Peevee is very addictive and effective dose is very small - just 5-15 mg.
I've been binging on peevee for a week and almost lost my mind! Paranoid delusions became everyday routine. I flushed around 100 doses down in toilet in the end