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1. The head of the penis, being vaguely bell shaped. Like a mushroom head.
2. A complete idiot.
When you are drunk, you dance like a bellend.
Similar to the common word "retard," only a "retard" is someone born with a disability who cannot help it. A "tard" is someone that is not innately mentally disabled. On the contrary, a tard is so damnably stupid and such a bellend, that they appear to be retarded to the untrained eye.
That tard thinks he can be me at Halo on PC with his XBOX controller.