1. Noun. A Pussy Seeking Missile (PSM for short) is any man who, upon achieving moderate-to-high levels of intoxication, will hound several women for an entire evening with the intent of not stopping until he's gone home with one of them.
2. Noun. One who seeks pussy with Missle-like precision.
Sean talked to four different girls all night, and finally wound up going home with Liz. That guy is a pussy seeking missile when he's drunk!