The period of time wherein one behaves in primate-like behavior. Typical of male homosapiens, monkeytime behavior includes excessive gestures of attraction towards the opposite sex, spontaneous masturbation, and occassional aggressive behavior towards other males.
"Dude, he's hitting on the girl who's helping him pick out a gift for his girlfriend!! Ha ha ha, MONKEYTIME! EIEIEIEIEIEIEIeeeeeeeeeeeIeIeIeIeIe"