A twinkleberry is often used in reference to a twink in a negative manner. A twinkleberry is often a young male, even a very young male, who maybe physically attractive (straight or gay) and is always trying to be the focus of everyone's attention. Often he interrupts conversation; is usually hyper, annoying but amusing enough that everyone puts up with his shit.
Hey, I like Ryanalot, but he is such a twinkleberry, he embarrasses the shit out of me sometimes.