What you feel like doing after a guy/girl you really like compliments you are is in close proximity to you.
Very strong feeling, almost like you want to grab them and do something to them, usually "naughty" in nature.
Has tremendous effects on your thoughts the rest of the day when you know they like you back.
Can also mean: A mental purr that lasts for a short while after you become slightly aroused by a crush, followed by mild genital arousal.
After so-and-so told me I did great on a test, I mentally purr ed to myself with pleasure.